$bokf 2018 Q4 10-K

Concept	2018 Q4	2017 Q4	2016 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.143B	$2.317B	$2.537B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$330.0M	$317.3M	$325.8M
YoY Change	4.0%	-2.61%	6.32%
Goodwill	$1.049B	$447.4M	$448.9M
YoY Change	134.51%	-0.33%	16.46%
Intangibles	$134.8M	$28.66M	$46.93M
YoY Change	370.55%	-38.94%	6.88%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$38.02B	$32.27B	$32.77B
YoY Change	17.81%	-1.53%	4.12%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$193.0M	$165.0M	$147.0M
YoY Change	16.97%	12.24%	22.5%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.018B	$575.0M	$727.0M
YoY Change	77.04%	-20.91%	-40.12%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$193.0M	$165.0M	$147.0M
YoY Change	16.97%	12.24%	22.5%
LONG-TERM LIABILITIES
Long-Term Debt	$300.0M	$180.0M	$191.0M
YoY Change	66.67%	-5.76%	-27.65%
Other Long-Term Liabilities	$702.0M	$673.0M	$854.0M
YoY Change	4.31%	-21.19%	18.12%
Total Long-Term Liabilities	$1.002B	$853.0M	$1.045B
YoY Change	17.47%	-18.37%	5.88%
TOTAL LIABILITIES
Total Short-Term Liabilities	$193.0M	$165.0M	$147.0M
Total Long-Term Liabilities	$1.002B	$853.0M	$1.045B
Total Liabilities	$33.58B	$28.75B	$29.47B
YoY Change	16.78%	-2.42%	4.46%
SHAREHOLDERS EQUITY
Retained Earnings	$3.370B	$3.048B	$2.823B
YoY Change	10.54%	7.97%	4.41%
Common Stock	$1.334B	$1.036B	$1.007B
YoY Change	28.78%	2.92%	2.5%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$199.0M	$552.8M	$544.1M
YoY Change	-64.01%	1.62%	14.02%
Treasury Stock Shares	3.589M shares	9.753M shares	9.656M shares
Shareholders Equity	$4.432B	$3.495B	$3.275B
YoY Change
Total Liabilities & Shareholders Equity	$38.02B	$32.27B	$32.77B
YoY Change	17.81%	-1.53%	4.12%

Concept	2018 Q4	2017 Q4	2016 Q4
OPERATING ACTIVITIES
Net Income	$108.5M	$72.50M	$50.00M
YoY Change	49.66%	45.0%	-16.11%
Depreciation, Depletion And Amortization	$18.80M	$15.30M	$11.80M
YoY Change	22.88%	29.66%	-196.72%
Cash From Operating Activities	-$162.6M	$392.1M	$399.4M
YoY Change	-141.47%	-1.83%	223.93%
INVESTING ACTIVITIES
Capital Expenditures	-$94.70M	-$79.90M	-$40.50M
YoY Change	18.52%	97.28%	-34.57%
Acquisitions
YoY Change
Other Investing Activities	-$676.7M	$486.3M	$65.50M
YoY Change	-239.15%	642.44%	-109.15%
Cash From Investing Activities	-$771.4M	$406.6M	$25.00M
YoY Change	-289.72%	1526.4%	-103.21%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	831.2M	-955.6M	-503.6M
YoY Change	-186.98%	89.75%	-151.46%
NET CHANGE
Cash From Operating Activities	-162.6M	392.1M	399.4M
Cash From Investing Activities	-771.4M	406.6M	25.00M
Cash From Financing Activities	831.2M	-955.6M	-503.6M
Net Change In Cash	-102.8M	-156.9M	-79.20M
YoY Change	-34.48%	98.11%	-124.42%
FREE CASH FLOW
Cash From Operating Activities	-$162.6M	$392.1M	$399.4M
Capital Expenditures	-$94.70M	-$79.90M	-$40.50M
Free Cash Flow	-$67.90M	$472.0M	$439.9M
YoY Change	-114.39%	7.3%	137.53%

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	14775000	USD
CY2017Q4	bokf	Capital Conservation Buffer Common Equity Tier Oneto Risk Weighted Assets CapitalConservationBufferCommonEquityTierOnetoRiskWeightedAssets	0.0250
CY2017Q4	bokf	Capital Conservation Buffer Tier1 Capitalto Risk Weighted Assets CapitalConservationBufferTier1CapitaltoRiskWeightedAssets	0.0250
CY2017Q4	bokf	Capital Conservation Buffer Total Capitalto Risk Weighted Assets CapitalConservationBufferTotalCapitaltoRiskWeightedAssets	0.0250
CY2017Q4	bokf	Common Equity Tier One Capitalto Risk Weighted Assets Minimum Requirement CommonEquityTierOneCapitaltoRiskWeightedAssetsMinimumRequirement	0.0450
CY2017	bokf	Credit Losses Recognized On Residential Mortgage Loans Held For Sale CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale	0	USD
CY2018	bokf	Credit Losses Recognized On Residential Mortgage Loans Held For Sale CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale	0	USD
CY2017Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Commonequity Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferCommonequityTierOnetoRiskWeightedAssets	0.0700
CY2017Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferTierOnetoRiskWeightedAssets	0.0850
CY2017Q4	bokf	Minimum Capital Requirement Including Capital Conservation Bufferfor Total Capitalto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferforTotalCapitaltoRiskWeightedAssets	0.1050
CY2017Q4	bokf	Minimum Capital Requirements Including Capital Conservation Buffer Tier One Capitalto Average Assets MinimumCapitalRequirementsIncludingCapitalConservationBufferTierOneCapitaltoAverageAssets	0.0400
CY2017	bokf	Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale	P90D
CY2018	bokf	Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale	P90D
CY2017Q4	bokf	Residential Mortgage Loans Held For Sale Nonperforming ResidentialMortgageLoansHeldForSaleNonperforming	0	USD
CY2018Q4	bokf	Residential Mortgage Loans Held For Sale Nonperforming ResidentialMortgageLoansHeldForSaleNonperforming	0	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum	150	USD
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum	150	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum	500	USD
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum	500	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-387000	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum	4000	USD
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum	4000	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum	1000	USD
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum	1000	USD
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum	88	USD
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum	93	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum	65	USD
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum	67	USD
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum	0.1516
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00006
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00006
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum	0.1574
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2017	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum	0.0872
CY2018	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum	0.0805
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2018	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	9827000	USD
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75147686	shares
CY2017	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	8123000	USD
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000875357
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	72251266	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	No
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	2441480672	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	BOK FINANCIAL CORP ET AL
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75711492	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75147686	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75711492	shares
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2017Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	12648000	USD
CY2018Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	13665000	USD
CY2017Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2017Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	9752749	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	3588560	shares
CY2018	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	891587000	USD
CY2017	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	696479000	USD
CY2016	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	581030000	USD
CY2018	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	8123000	USD
CY2017	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	8706000	USD
CY2016	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	6296000	USD
CY2016	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	12658000	USD
CY2018	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	57531000	USD
CY2017	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	17002000	USD
CY2016	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	8527000	USD
CY2017	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	16121000	USD
CY2016	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	16894000	USD
CY2018	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	197317000	USD
CY2017	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	177070000	USD
CY2016	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	175321000	USD
CY2018	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	15205000	USD
CY2017	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	16755000	USD
CY2016	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	6723000	USD
CY2018	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	21555000	USD
CY2017	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	18490000	USD
CY2016	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17238000	USD
CY2018	bokf	Interestincome Interestbearingcashandcashequivalents InterestincomeInterestbearingcashandcashequivalents	22333000	USD
CY2017	bokf	Interestincome Interestbearingcashandcashequivalents InterestincomeInterestbearingcashandcashequivalents	22128000	USD
CY2016	bokf	Interestincome Interestbearingcashandcashequivalents InterestincomeInterestbearingcashandcashequivalents	10726000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1228426000	USD
CY2017	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	972751000	USD
CY2016	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	829117000	USD
CY2018	us-gaap	Interest Expense Deposits InterestExpenseDeposits	95517000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	53803000	USD
CY2016	us-gaap	Interest Expense Deposits InterestExpenseDeposits	40494000	USD
CY2018	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	138215000	USD
CY2017	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	69124000	USD
CY2016	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	35099000	USD
CY2018	us-gaap	Interest Expense InterestExpense	243559000	USD
CY2017	us-gaap	Interest Expense InterestExpense	131050000	USD
CY2016	us-gaap	Interest Expense InterestExpense	81889000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	984867000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	841701000	USD
CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	747228000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8000000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-7000000	USD
CY2016	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	65000000	USD
CY2018	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	976867000	USD
CY2017	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	848701000	USD
CY2016	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	682228000	USD
CY2018	bokf	Total Fees And Commissions TotalFeesAndCommissions	643642000	USD
CY2017	bokf	Total Fees And Commissions TotalFeesAndCommissions	681235000	USD
CY2016	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	26582000	USD
CY2018	bokf	Contributions To Bokf Foundation ContributionsToBokfFoundation	2846000	USD
CY2017	bokf	Contributions To Bokf Foundation ContributionsToBokfFoundation	2000000	USD
CY2016	bokf	Contributions To Bokf Foundation ContributionsToBokfFoundation	2000000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	553119000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-9687000	USD
CY2018	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	30523000	USD
CY2017	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	28877000	USD
CY2016	bokf	Total Fees And Commissions TotalFeesAndCommissions	685831000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2731000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	11213000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	4947000	USD
CY2018	us-gaap	Gain Loss From Price Risk Management Activity GainLossFromPriceRiskManagementActivity	-422000	USD
CY2017	us-gaap	Gain Loss From Price Risk Management Activity GainLossFromPriceRiskManagementActivity	779000	USD
CY2016	us-gaap	Gain Loss From Price Risk Management Activity GainLossFromPriceRiskManagementActivity	-15685000	USD
CY2018	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	-25572000	USD
CY2017	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	-2733000	USD
CY2016	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	-10555000	USD
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-4668000	USD
CY2017	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-172000	USD
CY2016	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2193000	USD
CY2018	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-2801000	USD
CY2017	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	4428000	USD
CY2016	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	11675000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	616784000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	695094000	USD
CY2016	us-gaap	Noninterest Income NoninterestIncome	674020000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	583131000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	573408000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	59099000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	51067000	USD
CY2016	us-gaap	Professional Fees ProfessionalFees	56783000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	97981000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	86477000	USD
CY2016	us-gaap	Occupancy Net OccupancyNet	80024000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	23318000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	19653000	USD
CY2016	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	32489000	USD
CY2018	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	114796000	USD
CY2017	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	146970000	USD
CY2016	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	131841000	USD
CY2018	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	17169000	USD
CY2017	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	15689000	USD
CY2016	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	15584000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-17052000	USD
CY2016	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-3359000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9620000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6779000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6862000	USD
CY2018	bokf	Mortgage Banking Costs MortgageBankingCosts	46298000	USD
CY2017	bokf	Mortgage Banking Costs MortgageBankingCosts	52856000	USD
CY2016	bokf	Mortgage Banking Costs MortgageBankingCosts	61387000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	26333000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	32054000	USD
CY2016	us-gaap	Other Noninterest Expense OtherNoninterestExpense	47560000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	1028166000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	1025517000	USD
CY2016	us-gaap	Noninterest Expense NoninterestExpense	1017590000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	565485000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	518278000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	338658000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	119061000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	182593000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	106377000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	335685000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	232281000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	778000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1041000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	445646000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	334644000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	232668000	USD
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.63
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.11
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.53
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.63
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.11
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.53
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66628640	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64745364	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65085627	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	66662273	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64806284	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	65143898	shares
CY2016	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-387000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	335685000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-48010000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	232281000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.90
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.77
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.73
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	778000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1041000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-26152000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-41521000	USD
CY2018	bokf	Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities	0	USD
CY2017	bokf	Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities	0	USD
CY2016	bokf	Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities	-112000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-2801000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	4428000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	11675000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-45209000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-30580000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-53308000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11507000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11923000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-20754000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33702000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-18657000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32554000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	412722000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	317028000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	199727000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	411944000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	315987000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	200114000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	741749000	USD
CY2017Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	602510000	USD
CY2018Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	401675000	USD
CY2017Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	1714544000	USD
CY2018Q4	us-gaap	Trading Securities TradingSecurities	1956923000	USD
CY2017Q4	us-gaap	Trading Securities TradingSecurities	462676000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	355187000	USD
CY2017Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	461793000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8857120000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8321578000	USD
CY2018Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	283235000	USD
CY2017Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	755054000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	344447000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	320189000	USD
CY2018Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage	149221000	USD
CY2017Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage	221378000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21656730000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17153424000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	207457000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	230682000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	21449273000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	16922742000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	330033000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	317335000	USD
CY2018Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	204960000	USD
CY2017Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	178800000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1049263000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	447430000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	134849000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	28658000	USD
CY2018Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	259254000	USD
CY2017Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	252867000	USD
CY2018Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	17487000	USD
CY2017Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	28437000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	320929000	USD
CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	220502000	USD
CY2018Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	381608000	USD
CY2017Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	316498000	USD
CY2018Q4	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	336400000	USD
CY2017Q4	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	340077000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	446891000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	359092000	USD
CY2018Q4	us-gaap	Assets Assets	38020504000	USD
CY2017Q4	us-gaap	Assets Assets	32272160000	USD
CY2018Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	10414592000	USD
CY2017Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	9243338000	USD
CY2018Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	12206576000	USD
CY2017Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	10250393000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	529215000	USD
CY2017Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	469158000	USD
CY2018Q4	us-gaap	Time Deposits TimeDeposits	2113380000	USD
CY2017Q4	us-gaap	Time Deposits TimeDeposits	2098416000	USD
CY2018Q4	us-gaap	Deposits Deposits	25263763000	USD
CY2017Q4	us-gaap	Deposits Deposits	22061305000	USD
CY2018Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	1018411000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	28753826000	USD
CY2017Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	574963000	USD
CY2018Q4	us-gaap	Other Borrowings OtherBorrowings	6124390000	USD
CY2017Q4	us-gaap	Other Borrowings OtherBorrowings	5134897000	USD
CY2018Q4	us-gaap	Subordinated Debt SubordinatedDebt	275913000	USD
CY2017Q4	us-gaap	Subordinated Debt SubordinatedDebt	144677000	USD
CY2018Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	192826000	USD
CY2017Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	164895000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	362306000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	171963000	USD
CY2018Q4	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	156370000	USD
CY2017Q4	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	338745000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	183480000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	162381000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	33577459000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	5000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	4000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1334030000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1035895000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3369654000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3048487000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	198995000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	552845000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-72585000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-36174000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4432109000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3495367000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	10936000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	22967000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4443045000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3518334000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	38020504000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32272160000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3267639000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	232281000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32554000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	66792000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense	12465000	USD
CY2016	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	1590000	USD
CY2016	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	95000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	113455000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10471000	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5193000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3306357000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	335685000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-18657000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	7403000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense	5758000	USD
CY2017	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	0	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1390000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23602000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	116041000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9577000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3518334000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3518334000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1 StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	3518334000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33702000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	53465000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense	2781000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2870000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4229000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	127188000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	701311000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	12809000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4443045000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	335685000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	232281000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8000000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-7000000	USD
CY2016	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	65000000	USD
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-4668000	USD
CY2017	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-172000	USD
CY2016	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2193000	USD
CY2018	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	33528000	USD
CY2017	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	33527000	USD
CY2016	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	40744000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-4686000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-3704000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-11234000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	4229000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	23602000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	10471000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	60843000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	54466000	USD
CY2016	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	47016000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-30945000	USD
CY2017	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-28693000	USD
CY2016	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-41643000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-9585000	USD
CY2017	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	2828000	USD
CY2016	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	13011000	USD
CY2018	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	35705000	USD
CY2017	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	47159000	USD
CY2016	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	63636000	USD
CY2018	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	2587297000	USD
CY2017	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	3286873000	USD
CY2016	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	6117417000	USD
CY2018	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	2691144000	USD
CY2017	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	3405890000	USD
CY2016	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	6193587000	USD
CY2018	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	35247000	USD
CY2017	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	39149000	USD
CY2016	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	71405000	USD
CY2018	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	1023097000	USD
CY2017	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	804204000	USD
CY2016	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-149921000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	38346000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-321880000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	603861000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-27507000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5506000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	49565000	USD
CY2018	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-5191000	USD
CY2017	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	18191000	USD
CY2016	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	44269000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-139346000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	182184000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-11413000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-552006000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	214931000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-91949000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	124864000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	112022000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	86847000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1122680000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1841217000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1740226000	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	4468000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	32972000	USD
CY2016	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	41590000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1955172000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2845557000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2333740000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	745643000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1309215000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	899381000	USD
CY2018	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	38347000	USD
CY2017	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	-68792000	USD
CY2016	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	33005000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1553033000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	78232000	USD
CY2016	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	621605000	USD
CY2018	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	114417000	USD
CY2017	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-479409000	USD
CY2016	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	103668000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	175755000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-56017000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	308762000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	274029000	USD
CY2016	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	198922000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	345082000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	250783000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	199802000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1807631000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	739556000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-286007000	USD
CY2018	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	-13870000	USD
CY2017	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	-563406000	USD
CY2016	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	1277285000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-73089000	USD
CY2017	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-123384000	USD
CY2016	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-216084000	USD
CY2018	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	1295484000	USD
CY2017	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-10909000	USD
CY2016	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-606476000	USD
CY2018	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2017	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2016	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	226550000	USD
CY2018	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	144615000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-41319000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	144690000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10389000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-88000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	4368000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12455000	USD
CY2018	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	85466000	USD
CY2017	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	-17726000	USD
CY2016	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	-28806000	USD
CY2018	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	-114076000	USD
CY2017	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	485119000	USD
CY2016	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	-106051000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	53465000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7403000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	66792000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	127188000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	116041000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	113455000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1186007000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1174930000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	271854000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1173630000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-220443000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-106102000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2317054000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2537497000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2643599000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1143424000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2537497000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	243121000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	127513000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	82876000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2317054000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	92291000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	121697000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	79883000	USD
CY2018	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	9880000	USD
CY2017	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	7367000	USD
CY2016	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	36391000	USD

CY2018

us-gaap

Interest And Dividend Income Securities Held To Maturity

InterestAndDividendIncomeSecuritiesHeldToMaturity

14775000

USD

CY2017Q4

bokf

Capital Conservation Buffer Common Equity Tier Oneto Risk Weighted Assets

CapitalConservationBufferCommonEquityTierOnetoRiskWeightedAssets

0.0250

CY2017Q4

bokf

Capital Conservation Buffer Tier1 Capitalto Risk Weighted Assets

CapitalConservationBufferTier1CapitaltoRiskWeightedAssets

0.0250

CY2017Q4

bokf

Capital Conservation Buffer Total Capitalto Risk Weighted Assets

CapitalConservationBufferTotalCapitaltoRiskWeightedAssets

0.0250

CY2017Q4

bokf

Common Equity Tier One Capitalto Risk Weighted Assets Minimum Requirement

CommonEquityTierOneCapitaltoRiskWeightedAssetsMinimumRequirement

0.0450

CY2017

bokf

Credit Losses Recognized On Residential Mortgage Loans Held For Sale

CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale

0

USD

CY2018

bokf

Credit Losses Recognized On Residential Mortgage Loans Held For Sale

CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale

0

USD

CY2017Q4

bokf

Minimum Capital Requirement Including Capital Conservation Buffer Commonequity Tier Oneto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferCommonequityTierOnetoRiskWeightedAssets

0.0700

CY2017Q4

bokf

Minimum Capital Requirement Including Capital Conservation Buffer Tier Oneto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferTierOnetoRiskWeightedAssets

0.0850

CY2017Q4

bokf

Minimum Capital Requirement Including Capital Conservation Bufferfor Total Capitalto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferforTotalCapitaltoRiskWeightedAssets

0.1050

CY2017Q4

bokf

Minimum Capital Requirements Including Capital Conservation Buffer Tier One Capitalto Average Assets

MinimumCapitalRequirementsIncludingCapitalConservationBufferTierOneCapitaltoAverageAssets

0.0400

CY2017

bokf

Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale

NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale

P90D

CY2018

bokf

Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale

NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale

P90D

CY2017Q4

bokf

Residential Mortgage Loans Held For Sale Nonperforming

ResidentialMortgageLoansHeldForSaleNonperforming

0

USD

CY2018Q4

bokf

Residential Mortgage Loans Held For Sale Nonperforming

ResidentialMortgageLoansHeldForSaleNonperforming

0

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum

150

USD

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum

150

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum

500

USD

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum

500

USD

CY2016

us-gaap

Net Income Loss Attributable To Noncontrolling Interest

NetIncomeLossAttributableToNoncontrollingInterest

-387000

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum

4000

USD

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum

4000

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum

1000

USD

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum

1000

USD

CY2018

dei

Entity Shell Company

EntityShellCompany

false

CY2018

dei

Entity Small Business

EntitySmallBusiness

false

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum

88

USD

CY2018

dei

Entity Voluntary Filers

EntityVoluntaryFilers

No

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum

93

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum

65

USD

CY2018

dei

Entity Well Known Seasoned Issuer

EntityWellKnownSeasonedIssuer

Yes

CY2017Q4

us-gaap

Capital Required For Capital Adequacy To Risk Weighted Assets

CapitalRequiredForCapitalAdequacyToRiskWeightedAssets

0.0800

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum

67

USD

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum

0.1516

CY2017Q4

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.00006

CY2018Q4

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.00006

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum

0.1574

CY2017Q4

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

2500000000

shares

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum

0.0872

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum

0.0805

CY2018

dei

Amendment Flag

AmendmentFlag

false

CY2018Q4

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

2500000000

shares

CY2018

us-gaap

Interest Expense Subordinated Notes And Debentures

InterestExpenseSubordinatedNotesAndDebentures

9827000

USD

CY2017Q4

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

75147686

shares

CY2017

us-gaap

Interest Expense Subordinated Notes And Debentures

InterestExpenseSubordinatedNotesAndDebentures

8123000

USD

CY2018

dei

Current Fiscal Year End Date

CurrentFiscalYearEndDate

--12-31

CY2018

dei

Document Fiscal Period Focus

DocumentFiscalPeriodFocus

FY

CY2018

dei

Document Fiscal Year Focus

DocumentFiscalYearFocus

2018

CY2018

dei

Document Period End Date

DocumentPeriodEndDate

2018-12-31

CY2018

dei

Document Type

DocumentType

10-K

CY2018

dei

Entity Central Index Key

EntityCentralIndexKey

0000875357

CY2019Q1

dei

Entity Common Stock Shares Outstanding

EntityCommonStockSharesOutstanding

72251266

shares

CY2018

dei

Entity Current Reporting Status

EntityCurrentReportingStatus

No

CY2018

dei

Entity Emerging Growth Company

EntityEmergingGrowthCompany

false

CY2018

dei

Entity Filer Category

EntityFilerCategory

Large Accelerated Filer

CY2018Q2

dei

Entity Public Float

EntityPublicFloat

2441480672

USD

CY2018

dei

Entity Registrant Name

EntityRegistrantName

BOK FINANCIAL CORP ET AL

CY2018Q4

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

75711492

shares

CY2017Q4

us-gaap

Common Stock Shares Outstanding

CommonStockSharesOutstanding

75147686

shares

CY2018Q4

us-gaap

Common Stock Shares Outstanding

CommonStockSharesOutstanding

75711492

shares

CY2017Q4

us-gaap

Deferred Tax Assets Valuation Allowance

DeferredTaxAssetsValuationAllowance

0

USD

CY2018Q4

us-gaap

Deferred Tax Assets Valuation Allowance

DeferredTaxAssetsValuationAllowance

0

USD

CY2017Q4

us-gaap

Real Estate Owned Valuation Allowance

RealEstateOwnedValuationAllowance

12648000

USD

CY2018Q4

us-gaap

Real Estate Owned Valuation Allowance

RealEstateOwnedValuationAllowance

13665000

USD

CY2017Q4

us-gaap

Tier One Leverage Capital Required For Capital Adequacy To Average Assets

TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets

0.0400

CY2017Q4

us-gaap

Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets

TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets

0.0600

CY2017Q4

us-gaap

Treasury Stock Shares

TreasuryStockShares

9752749

shares

CY2018Q4

us-gaap

Treasury Stock Shares

TreasuryStockShares

3588560

shares

CY2018

us-gaap

Interest And Fee Income Loans And Leases Held In Portfolio

InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio

891587000

USD

CY2017

us-gaap

Interest And Fee Income Loans And Leases Held In Portfolio

InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio

696479000

USD

CY2016

us-gaap

Interest And Fee Income Loans And Leases Held In Portfolio

InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio

581030000

USD

CY2018

us-gaap

Interest And Fee Income Loans Held For Sale Mortgages

InterestAndFeeIncomeLoansHeldForSaleMortgages

8123000

USD

CY2017

us-gaap

Interest And Fee Income Loans Held For Sale Mortgages

InterestAndFeeIncomeLoansHeldForSaleMortgages

8706000

USD

CY2016

us-gaap

Interest Expense Subordinated Notes And Debentures

InterestExpenseSubordinatedNotesAndDebentures

6296000

USD

CY2016

us-gaap

Interest And Fee Income Loans Held For Sale Mortgages

InterestAndFeeIncomeLoansHeldForSaleMortgages

12658000

USD

CY2018

us-gaap

Interest And Dividend Income Securities Trading Or Measured At Fair Value

InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue

57531000

USD

CY2017

us-gaap

Interest And Dividend Income Securities Trading Or Measured At Fair Value

InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue

17002000

USD

CY2016

us-gaap

Interest And Dividend Income Securities Trading Or Measured At Fair Value

InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue

8527000

USD

CY2017

us-gaap

Interest And Dividend Income Securities Held To Maturity

InterestAndDividendIncomeSecuritiesHeldToMaturity

16121000

USD

CY2016

us-gaap

Interest And Dividend Income Securities Held To Maturity

InterestAndDividendIncomeSecuritiesHeldToMaturity

16894000

USD

CY2018

us-gaap

Interest And Dividend Income Securities Available For Sale

InterestAndDividendIncomeSecuritiesAvailableForSale

197317000

USD

CY2017

us-gaap

Interest And Dividend Income Securities Available For Sale

InterestAndDividendIncomeSecuritiesAvailableForSale

177070000

USD

CY2016

us-gaap

Interest And Dividend Income Securities Available For Sale

InterestAndDividendIncomeSecuritiesAvailableForSale

175321000

USD

CY2018

bokf

Interest Revenue On Fair Value Option Securities

InterestRevenueOnFairValueOptionSecurities

15205000

USD

CY2017

bokf

Interest Revenue On Fair Value Option Securities

InterestRevenueOnFairValueOptionSecurities

16755000

USD

CY2016

bokf

Interest Revenue On Fair Value Option Securities

InterestRevenueOnFairValueOptionSecurities

6723000

USD

CY2018

us-gaap

Other Interest And Dividend Income

OtherInterestAndDividendIncome

21555000

USD

CY2017

us-gaap

Other Interest And Dividend Income

OtherInterestAndDividendIncome

18490000

USD

CY2016

us-gaap

Other Interest And Dividend Income

OtherInterestAndDividendIncome

17238000

USD

CY2018

bokf

Interestincome Interestbearingcashandcashequivalents

InterestincomeInterestbearingcashandcashequivalents

22333000

USD

CY2017

bokf

Interestincome Interestbearingcashandcashequivalents

InterestincomeInterestbearingcashandcashequivalents

22128000

USD

CY2016

bokf

Interestincome Interestbearingcashandcashequivalents

InterestincomeInterestbearingcashandcashequivalents

10726000

USD

CY2018

us-gaap

Interest And Dividend Income Operating

InterestAndDividendIncomeOperating

1228426000

USD

CY2017

us-gaap

Interest And Dividend Income Operating

InterestAndDividendIncomeOperating

972751000

USD

CY2016

us-gaap

Interest And Dividend Income Operating

InterestAndDividendIncomeOperating

829117000

USD

CY2018

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

95517000

USD

CY2017

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

53803000

USD

CY2016

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

40494000

USD

CY2018

us-gaap

Interest Expense Short Term Borrowings

InterestExpenseShortTermBorrowings

138215000

USD

CY2017

us-gaap

Interest Expense Short Term Borrowings

InterestExpenseShortTermBorrowings

69124000

USD

CY2016

us-gaap

Interest Expense Short Term Borrowings

InterestExpenseShortTermBorrowings

35099000

USD

CY2018

us-gaap

Interest Expense

InterestExpense

243559000

USD

CY2017

us-gaap

Interest Expense

InterestExpense

131050000

USD

CY2016

us-gaap

Interest Expense

InterestExpense

81889000

USD

CY2018

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

984867000

USD

CY2017

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

841701000

USD

CY2016

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

747228000

USD

CY2018

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

8000000

USD

CY2017

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

-7000000

USD

CY2016

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

65000000

USD

CY2018

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

976867000

USD

CY2017

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

848701000

USD

CY2016

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

682228000

USD

CY2018

bokf

Total Fees And Commissions

TotalFeesAndCommissions

643642000

USD

CY2017

bokf

Total Fees And Commissions

TotalFeesAndCommissions

681235000

USD

CY2016

us-gaap

Marketing And Advertising Expense

MarketingAndAdvertisingExpense

26582000

USD

CY2018

bokf

Contributions To Bokf Foundation

ContributionsToBokfFoundation

2846000

USD

CY2017

bokf

Contributions To Bokf Foundation

ContributionsToBokfFoundation

2000000

USD

CY2016

bokf

Contributions To Bokf Foundation

ContributionsToBokfFoundation

2000000

USD

CY2016

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

553119000

USD

CY2017

us-gaap

Gains Losses On Sales Of Other Real Estate

GainsLossesOnSalesOfOtherRealEstate

-9687000

USD

CY2018

us-gaap

Marketing And Advertising Expense

MarketingAndAdvertisingExpense

30523000

USD

CY2017

us-gaap

Marketing And Advertising Expense

MarketingAndAdvertisingExpense

28877000

USD

CY2016

bokf

Total Fees And Commissions

TotalFeesAndCommissions

685831000

USD

CY2018

us-gaap

Gain Loss On Disposition Of Assets1

GainLossOnDispositionOfAssets1

-2731000

USD

CY2017

us-gaap

Gain Loss On Disposition Of Assets1

GainLossOnDispositionOfAssets1

11213000

USD

CY2016

us-gaap

Gain Loss On Disposition Of Assets1

GainLossOnDispositionOfAssets1

4947000

USD

CY2018

us-gaap

Gain Loss From Price Risk Management Activity

GainLossFromPriceRiskManagementActivity

-422000

USD

CY2017

us-gaap

Gain Loss From Price Risk Management Activity

GainLossFromPriceRiskManagementActivity

779000

USD

CY2016

us-gaap

Gain Loss From Price Risk Management Activity

GainLossFromPriceRiskManagementActivity

-15685000

USD

CY2018

bokf

Gain On Fair Value Option Securities Net

GainOnFairValueOptionSecuritiesNet

-25572000

USD

CY2017

bokf

Gain On Fair Value Option Securities Net

GainOnFairValueOptionSecuritiesNet

-2733000

USD

CY2016

bokf

Gain On Fair Value Option Securities Net

GainOnFairValueOptionSecuritiesNet

-10555000

USD

CY2018

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

-4668000

USD

CY2017

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

-172000

USD

CY2016

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

2193000

USD

CY2018

us-gaap

Debt Securities Realized Gain Loss

DebtSecuritiesRealizedGainLoss

-2801000

USD

CY2017

us-gaap

Debt Securities Realized Gain Loss

DebtSecuritiesRealizedGainLoss

4428000

USD

CY2016

us-gaap

Debt Securities Realized Gain Loss

DebtSecuritiesRealizedGainLoss

11675000

USD

CY2018

us-gaap

Noninterest Income

NoninterestIncome

616784000

USD

CY2017

us-gaap

Noninterest Income

NoninterestIncome

695094000

USD

CY2016

us-gaap

Noninterest Income

NoninterestIncome

674020000

USD

CY2018

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

583131000

USD

CY2017

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

573408000

USD

CY2018

us-gaap

Professional Fees

ProfessionalFees

59099000

USD

CY2017

us-gaap

Professional Fees

ProfessionalFees

51067000

USD

CY2016

us-gaap

Professional Fees

ProfessionalFees

56783000

USD

CY2018

us-gaap

Occupancy Net

OccupancyNet

97981000

USD

CY2017

us-gaap

Occupancy Net

OccupancyNet

86477000

USD

CY2016

us-gaap

Occupancy Net

OccupancyNet

80024000

USD

CY2018

us-gaap

Federal Deposit Insurance Corporation Premium Expense

FederalDepositInsuranceCorporationPremiumExpense

23318000

USD

CY2017

us-gaap

Federal Deposit Insurance Corporation Premium Expense

FederalDepositInsuranceCorporationPremiumExpense

19653000

USD

CY2016

us-gaap

Federal Deposit Insurance Corporation Premium Expense

FederalDepositInsuranceCorporationPremiumExpense

32489000

USD

CY2018

us-gaap

Communications And Information Technology

CommunicationsAndInformationTechnology

114796000

USD

CY2017

us-gaap

Communications And Information Technology

CommunicationsAndInformationTechnology

146970000

USD

CY2016

us-gaap

Communications And Information Technology

CommunicationsAndInformationTechnology

131841000

USD

CY2018

us-gaap

Supplies And Postage Expense

SuppliesAndPostageExpense

17169000

USD

CY2017

us-gaap

Supplies And Postage Expense

SuppliesAndPostageExpense

15689000

USD

CY2016

us-gaap

Supplies And Postage Expense

SuppliesAndPostageExpense

15584000

USD

CY2018

us-gaap

Gains Losses On Sales Of Other Real Estate

GainsLossesOnSalesOfOtherRealEstate

-17052000

USD

CY2016

us-gaap

Gains Losses On Sales Of Other Real Estate

GainsLossesOnSalesOfOtherRealEstate

-3359000

USD

CY2018

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

9620000

USD

CY2017

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

6779000

USD

CY2016

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

6862000

USD

CY2018

bokf

Mortgage Banking Costs

MortgageBankingCosts

46298000

USD

CY2017

bokf

Mortgage Banking Costs

MortgageBankingCosts

52856000

USD

CY2016

bokf

Mortgage Banking Costs

MortgageBankingCosts

61387000

USD

CY2018

us-gaap

Other Noninterest Expense

OtherNoninterestExpense

26333000

USD

CY2017

us-gaap

Other Noninterest Expense

OtherNoninterestExpense

32054000

USD

CY2016

us-gaap

Other Noninterest Expense

OtherNoninterestExpense

47560000

USD

CY2018

us-gaap

Noninterest Expense

NoninterestExpense

1028166000

USD

CY2017

us-gaap

Noninterest Expense

NoninterestExpense

1025517000

USD

CY2016

us-gaap

Noninterest Expense

NoninterestExpense

1017590000

USD

CY2018

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

565485000

USD

CY2017

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

518278000

USD

CY2016

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

338658000

USD

CY2018

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

119061000

USD

CY2017

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

182593000

USD

CY2016

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

106377000

USD

CY2018

us-gaap

Profit Loss

ProfitLoss

446424000

USD

CY2017

us-gaap

Profit Loss

ProfitLoss

335685000

USD

CY2016

us-gaap

Profit Loss

ProfitLoss

232281000

USD

CY2018

us-gaap

Net Income Loss Attributable To Noncontrolling Interest

NetIncomeLossAttributableToNoncontrollingInterest

778000

USD

CY2017

us-gaap

Net Income Loss Attributable To Noncontrolling Interest

NetIncomeLossAttributableToNoncontrollingInterest

1041000

USD

CY2018

us-gaap

Net Income Loss

NetIncomeLoss

445646000

USD

CY2017

us-gaap

Net Income Loss

NetIncomeLoss

334644000

USD

CY2016

us-gaap

Net Income Loss

NetIncomeLoss

232668000

USD

CY2018

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

6.63

CY2017

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

5.11

CY2016

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.53

CY2018

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

6.63

CY2017

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

5.11

CY2016

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.53

CY2018

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

66628640

shares

CY2017

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

64745364

shares

CY2016

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

65085627

shares

CY2018

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

66662273

shares

CY2017

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

64806284

shares

CY2016

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

65143898

shares

CY2016

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

-387000

USD

CY2018

us-gaap

Profit Loss

ProfitLoss

446424000

USD

CY2017

us-gaap

Profit Loss

ProfitLoss

335685000

USD

CY2018

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-48010000

USD

CY2016

us-gaap

Profit Loss

ProfitLoss

232281000

USD

CY2018

us-gaap

Common Stock Dividends Per Share Declared

CommonStockDividendsPerShareDeclared

1.90

CY2017

us-gaap

Common Stock Dividends Per Share Declared

CommonStockDividendsPerShareDeclared

1.77

CY2016

us-gaap

Common Stock Dividends Per Share Declared

CommonStockDividendsPerShareDeclared

1.73

CY2018

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

778000

USD

CY2017

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

1041000

USD

CY2017

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-26152000

USD

CY2016

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-41521000

USD

CY2018

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

0

USD

CY2017

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

0

USD

CY2016

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

-112000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

-2801000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

4428000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

11675000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-45209000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-30580000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-53308000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-11507000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-11923000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-20754000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-33702000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-18657000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-32554000

USD

CY2018

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

412722000

USD

CY2017

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

317028000

USD

CY2016

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

199727000

USD

CY2018

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

411944000

USD

CY2017

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

315987000

USD

CY2016

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

200114000

USD

CY2018Q4

us-gaap

Cash And Due From Banks

CashAndDueFromBanks

741749000

USD

CY2017Q4

us-gaap

Cash And Due From Banks

CashAndDueFromBanks

602510000

USD

CY2018Q4

us-gaap

Interest Bearing Deposits In Banks

InterestBearingDepositsInBanks

401675000

USD

CY2017Q4

us-gaap

Interest Bearing Deposits In Banks

InterestBearingDepositsInBanks

1714544000

USD

CY2018Q4

us-gaap

Trading Securities

TradingSecurities

1956923000

USD

CY2017Q4

us-gaap

Trading Securities

TradingSecurities

462676000

USD

CY2018Q4

us-gaap

Held To Maturity Securities

HeldToMaturitySecurities

355187000

USD

CY2017Q4

us-gaap

Held To Maturity Securities

HeldToMaturitySecurities

461793000

USD

CY2018Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

8857120000

USD

CY2017Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

8321578000

USD

CY2018Q4

bokf

Fair Value Option Securities

FairValueOptionSecurities

283235000

USD

CY2017Q4

bokf

Fair Value Option Securities

FairValueOptionSecurities

755054000

USD

CY2018Q4

us-gaap

Federal Home Loan Bank Stock And Federal Reserve Bank Stock

FederalHomeLoanBankStockAndFederalReserveBankStock

344447000

USD

CY2017Q4

us-gaap

Federal Home Loan Bank Stock And Federal Reserve Bank Stock

FederalHomeLoanBankStockAndFederalReserveBankStock

320189000

USD

CY2018Q4

us-gaap

Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage

LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage

149221000

USD

CY2017Q4

us-gaap

Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage

LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage

221378000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

207457000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

230682000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Net Reported Amount

LoansAndLeasesReceivableNetReportedAmount

21449273000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Net Reported Amount

LoansAndLeasesReceivableNetReportedAmount

16922742000

USD

CY2018Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

330033000

USD

CY2017Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

317335000

USD

CY2018Q4

us-gaap

Accrued Investment Income Receivable

AccruedInvestmentIncomeReceivable

204960000

USD

CY2017Q4

us-gaap

Accrued Investment Income Receivable

AccruedInvestmentIncomeReceivable

178800000

USD

CY2018Q4

us-gaap

Goodwill

1049263000

USD

CY2017Q4

us-gaap

Goodwill

447430000

USD

CY2018Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

134849000

USD

CY2017Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

28658000

USD

CY2018Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

259254000

USD

CY2017Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

252867000

USD

CY2018Q4

us-gaap

Other Real Estate And Foreclosed Assets

OtherRealEstateAndForeclosedAssets

17487000

USD

CY2017Q4

us-gaap

Other Real Estate And Foreclosed Assets

OtherRealEstateAndForeclosedAssets

28437000

USD

CY2018Q4

us-gaap

Derivative Assets

DerivativeAssets

320929000

USD

CY2017Q4

us-gaap

Derivative Assets

DerivativeAssets

220502000

USD

CY2018Q4

us-gaap

Bank Owned Life Insurance

BankOwnedLifeInsurance

381608000

USD

CY2017Q4

us-gaap

Bank Owned Life Insurance

BankOwnedLifeInsurance

316498000

USD

CY2018Q4

us-gaap

Receivables From Brokers Dealers And Clearing Organizations

ReceivablesFromBrokersDealersAndClearingOrganizations

336400000

USD

CY2017Q4

us-gaap

Receivables From Brokers Dealers And Clearing Organizations

ReceivablesFromBrokersDealersAndClearingOrganizations

340077000

USD

CY2018Q4

us-gaap

Other Assets

OtherAssets

446891000

USD

CY2017Q4

us-gaap

Other Assets

OtherAssets

359092000

USD

CY2018Q4

us-gaap

Assets

38020504000

USD

CY2017Q4

us-gaap

Assets

32272160000

USD

CY2018Q4

us-gaap

Noninterest Bearing Deposit Liabilities Domestic

NoninterestBearingDepositLiabilitiesDomestic

10414592000

USD

CY2017Q4

us-gaap

Noninterest Bearing Deposit Liabilities Domestic

NoninterestBearingDepositLiabilitiesDomestic

9243338000

USD

CY2018Q4

us-gaap

Demand Deposit Accounts

DemandDepositAccounts

12206576000

USD

CY2017Q4

us-gaap

Demand Deposit Accounts

DemandDepositAccounts

10250393000

USD

CY2018Q4

us-gaap

Deposits Savings Deposits

DepositsSavingsDeposits

529215000

USD

CY2017Q4

us-gaap

Deposits Savings Deposits

DepositsSavingsDeposits

469158000

USD

CY2018Q4

us-gaap

Time Deposits

TimeDeposits

2113380000

USD

CY2017Q4

us-gaap

Time Deposits

TimeDeposits

2098416000

USD

CY2018Q4

us-gaap

Deposits

25263763000

USD

CY2017Q4

us-gaap

Deposits

22061305000

USD

CY2018Q4

us-gaap

Federal Funds Purchased And Securities Sold Under Agreements To Repurchase

FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase

1018411000

USD

CY2017Q4

us-gaap

Liabilities

28753826000

USD

CY2017Q4

us-gaap

Federal Funds Purchased And Securities Sold Under Agreements To Repurchase

FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase

574963000

USD

CY2018Q4

us-gaap

Other Borrowings

OtherBorrowings

6124390000

USD

CY2017Q4

us-gaap

Other Borrowings

OtherBorrowings

5134897000

USD

CY2018Q4

us-gaap

Subordinated Debt

SubordinatedDebt

275913000

USD

CY2017Q4

us-gaap

Subordinated Debt

SubordinatedDebt

144677000

USD

CY2018Q4

us-gaap

Accounts Payable And Accrued Liabilities Current And Noncurrent

AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

192826000

USD

CY2017Q4

us-gaap

Accounts Payable And Accrued Liabilities Current And Noncurrent

AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

164895000

USD

CY2018Q4

us-gaap

Derivative Liabilities

DerivativeLiabilities

362306000

USD

CY2017Q4

us-gaap

Derivative Liabilities

DerivativeLiabilities

171963000

USD

CY2018Q4

us-gaap

Payables To Broker Dealers And Clearing Organizations

PayablesToBrokerDealersAndClearingOrganizations

156370000

USD

CY2017Q4

us-gaap

Payables To Broker Dealers And Clearing Organizations

PayablesToBrokerDealersAndClearingOrganizations

338745000

USD

CY2018Q4

us-gaap

Other Liabilities

OtherLiabilities

183480000

USD

CY2017Q4

us-gaap

Other Liabilities

OtherLiabilities

162381000

USD

CY2018Q4

us-gaap

Liabilities

33577459000

USD

CY2018Q4

us-gaap

Common Stock Value

CommonStockValue

5000

USD

CY2017Q4

us-gaap

Common Stock Value

CommonStockValue

4000

USD

CY2018Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

1334030000

USD

CY2017Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

1035895000

USD

CY2018Q4

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

3369654000

USD

CY2017Q4

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

3048487000

USD

CY2018Q4

us-gaap

Treasury Stock Value

TreasuryStockValue

198995000

USD

CY2017Q4

us-gaap

Treasury Stock Value

TreasuryStockValue

552845000

USD

CY2018Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-72585000

USD

CY2017Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-36174000

USD

CY2018Q4

us-gaap

Stockholders Equity

StockholdersEquity

4432109000

USD

CY2017Q4

us-gaap

Stockholders Equity

StockholdersEquity

3495367000

USD

CY2018Q4

us-gaap

Minority Interest

MinorityInterest

10936000

USD

CY2017Q4

us-gaap

Minority Interest

MinorityInterest

22967000

USD

CY2018Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

4443045000

USD

CY2017Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

3518334000

USD

CY2018Q4

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

38020504000

USD

CY2017Q4

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

32272160000

USD

CY2015Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

3267639000

USD

CY2016

us-gaap

Profit Loss

ProfitLoss

232281000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-32554000

USD

CY2016

us-gaap

Treasury Stock Value Acquired Par Value Method

TreasuryStockValueAcquiredParValueMethod

66792000

USD

CY2016

us-gaap

Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense

StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense

12465000

USD

CY2016

us-gaap

Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net

AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet

1590000

USD

CY2016

us-gaap

Adjustments Related To Tax Withholding For Share Based Compensation

AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

95000

USD

CY2016

us-gaap

Dividends Common Stock Cash

DividendsCommonStockCash

113455000

USD

CY2016

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

10471000

USD

CY2016

us-gaap

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

5193000

USD

CY2016Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

3306357000

USD

CY2017

us-gaap

Profit Loss

ProfitLoss

335685000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-18657000

USD

CY2017

us-gaap

Treasury Stock Value Acquired Par Value Method

TreasuryStockValueAcquiredParValueMethod

7403000

USD

CY2017

us-gaap

Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense

StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense

5758000

USD

CY2017

us-gaap

Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net

AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet

0

USD

CY2017

us-gaap

Adjustments Related To Tax Withholding For Share Based Compensation

AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

1390000

USD

CY2017

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

23602000

USD

CY2017

us-gaap

Dividends Common Stock Cash

DividendsCommonStockCash

116041000

USD

CY2017

us-gaap

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

9577000

USD

CY2017Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

3518334000

USD

CY2017Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

3518334000

USD

CY2017Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1

3518334000

USD

CY2018

us-gaap

Profit Loss

ProfitLoss

446424000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-33702000

USD

CY2018

us-gaap

Treasury Stock Value Acquired Par Value Method

TreasuryStockValueAcquiredParValueMethod

53465000

USD

CY2018

us-gaap

Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense

StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense

2781000

USD

CY2018

us-gaap

Adjustments Related To Tax Withholding For Share Based Compensation

AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

2870000

USD

CY2018

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

4229000

USD

CY2018

us-gaap

Dividends Common Stock Cash

DividendsCommonStockCash

127188000

USD

CY2018

us-gaap

Stock Issued During Period Value Acquisitions

StockIssuedDuringPeriodValueAcquisitions

701311000

USD

CY2018

us-gaap

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

12809000

USD

CY2018Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

4443045000

USD

CY2018

us-gaap

Profit Loss

ProfitLoss

446424000

USD

CY2017

us-gaap

Profit Loss

ProfitLoss

335685000

USD

CY2016

us-gaap

Profit Loss

ProfitLoss

232281000

USD

CY2018

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

8000000

USD

CY2017

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

-7000000

USD

CY2016

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

65000000

USD

CY2018

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

-4668000

USD

CY2017

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

-172000

USD

CY2016

us-gaap

Mortgage Servicing Rights Msr Impairment Recovery

MortgageServicingRightsMSRImpairmentRecovery

2193000

USD

CY2018

bokf

Changeinfairvalueofmortgageservicingrightsduetoloanrunoff

33528000

USD

CY2017

bokf

Changeinfairvalueofmortgageservicingrightsduetoloanrunoff

33527000

USD

CY2016

bokf

Changeinfairvalueofmortgageservicingrightsduetoloanrunoff

40744000

USD

CY2018

us-gaap

Unrealized Gain Loss On Derivatives

UnrealizedGainLossOnDerivatives

-4686000

USD

CY2017

us-gaap

Unrealized Gain Loss On Derivatives

UnrealizedGainLossOnDerivatives

-3704000

USD

CY2016

us-gaap

Unrealized Gain Loss On Derivatives

UnrealizedGainLossOnDerivatives

-11234000

USD

CY2018

us-gaap

Share Based Compensation

ShareBasedCompensation

4229000

USD

CY2017

us-gaap

Share Based Compensation

ShareBasedCompensation

23602000

USD

CY2016

us-gaap

Share Based Compensation

ShareBasedCompensation

10471000

USD

CY2018

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

60843000

USD

CY2017

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

54466000

USD

CY2016

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

47016000

USD

CY2018

us-gaap

Accretion Amortization Of Discounts And Premiums Investments

AccretionAmortizationOfDiscountsAndPremiumsInvestments

-30945000

USD

CY2017

us-gaap

Accretion Amortization Of Discounts And Premiums Investments

AccretionAmortizationOfDiscountsAndPremiumsInvestments

-28693000

USD

CY2016

us-gaap

Accretion Amortization Of Discounts And Premiums Investments

AccretionAmortizationOfDiscountsAndPremiumsInvestments

-41643000

USD

CY2018

us-gaap

Realized Investment Gains Losses

RealizedInvestmentGainsLosses

-9585000

USD

CY2017

us-gaap

Realized Investment Gains Losses

RealizedInvestmentGainsLosses

2828000

USD

CY2016

us-gaap

Realized Investment Gains Losses

RealizedInvestmentGainsLosses

13011000

USD

CY2018

bokf

Netgainonmortgageloansheldforsale

35705000

USD

CY2017

bokf

Netgainonmortgageloansheldforsale

47159000

USD

CY2016

bokf

Netgainonmortgageloansheldforsale

63636000

USD

CY2018

us-gaap

Payments For Origination Of Mortgage Loans Held For Sale

PaymentsForOriginationOfMortgageLoansHeldForSale

2587297000

USD

CY2017

us-gaap

Payments For Origination Of Mortgage Loans Held For Sale

PaymentsForOriginationOfMortgageLoansHeldForSale

3286873000

USD

CY2016

us-gaap

Payments For Origination Of Mortgage Loans Held For Sale

PaymentsForOriginationOfMortgageLoansHeldForSale

6117417000

USD

CY2018

us-gaap

Proceeds From Sale Of Mortgage Loans Held For Sale

ProceedsFromSaleOfMortgageLoansHeldForSale

2691144000

USD

CY2017

us-gaap

Proceeds From Sale Of Mortgage Loans Held For Sale

ProceedsFromSaleOfMortgageLoansHeldForSale

3405890000

USD

CY2016

us-gaap

Proceeds From Sale Of Mortgage Loans Held For Sale

ProceedsFromSaleOfMortgageLoansHeldForSale

6193587000

USD

CY2018

bokf

Capitalizedmortgageservicingrights

35247000

USD

CY2017

bokf

Capitalizedmortgageservicingrights

39149000

USD

CY2016

bokf

Capitalizedmortgageservicingrights

71405000

USD

CY2018

us-gaap

Increase Decrease In Trading Securities

IncreaseDecreaseInTradingSecurities

1023097000

USD

CY2017

us-gaap

Increase Decrease In Trading Securities

IncreaseDecreaseInTradingSecurities

804204000

USD

CY2016

us-gaap

Increase Decrease In Trading Securities

IncreaseDecreaseInTradingSecurities

-149921000

USD

CY2018

us-gaap

Increase Decrease In Receivables

IncreaseDecreaseInReceivables

38346000

USD

CY2017

us-gaap

Increase Decrease In Receivables

IncreaseDecreaseInReceivables

-321880000

USD

CY2016

us-gaap

Increase Decrease In Receivables

IncreaseDecreaseInReceivables

603861000

USD

CY2018

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

-27507000

USD

CY2017

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

5506000

USD

CY2016

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

49565000

USD

CY2018

us-gaap

Increase Decrease In Other Accounts Payable And Accrued Liabilities

IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities

-5191000

USD

CY2017

us-gaap

Increase Decrease In Other Accounts Payable And Accrued Liabilities

IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities

18191000

USD

CY2016

us-gaap

Increase Decrease In Other Accounts Payable And Accrued Liabilities

IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities

44269000

USD

CY2018

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

-139346000

USD

CY2017

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

182184000

USD

CY2016

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

-11413000

USD

CY2018

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

-552006000

USD

CY2017

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

214931000

USD

CY2016

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

-91949000

USD

CY2018

us-gaap

Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

124864000

USD

CY2017

us-gaap

Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

112022000

USD

CY2016

us-gaap

Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

86847000

USD

CY2018

us-gaap

Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

1122680000

USD

CY2017

us-gaap

Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

1841217000

USD

CY2016

us-gaap

Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

1740226000

USD

CY2018

us-gaap

Payments To Acquire Held To Maturity Securities

PaymentsToAcquireHeldToMaturitySecurities

4468000

USD

CY2017

us-gaap

Payments To Acquire Held To Maturity Securities

PaymentsToAcquireHeldToMaturitySecurities

32972000

USD

CY2016

us-gaap

Payments To Acquire Held To Maturity Securities

PaymentsToAcquireHeldToMaturitySecurities

41590000

USD

CY2018

us-gaap

Payments To Acquire Available For Sale Securities Debt

PaymentsToAcquireAvailableForSaleSecuritiesDebt

1955172000

USD

CY2017

us-gaap

Payments To Acquire Available For Sale Securities Debt

PaymentsToAcquireAvailableForSaleSecuritiesDebt

2845557000

USD

CY2016

us-gaap

Payments To Acquire Available For Sale Securities Debt

PaymentsToAcquireAvailableForSaleSecuritiesDebt

2333740000

USD

CY2018

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

745643000

USD

CY2017

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

1309215000

USD

CY2016

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

899381000

USD

CY2018

bokf

Change In Amount Receivable On Unsettled Security Transactions

ChangeInAmountReceivableOnUnsettledSecurityTransactions

38347000

USD

CY2017

bokf

Change In Amount Receivable On Unsettled Security Transactions

ChangeInAmountReceivableOnUnsettledSecurityTransactions

-68792000

USD

CY2016

bokf

Change In Amount Receivable On Unsettled Security Transactions

ChangeInAmountReceivableOnUnsettledSecurityTransactions

33005000

USD

CY2018

us-gaap

Payments For Proceeds From Loans And Leases

PaymentsForProceedsFromLoansAndLeases

1553033000

USD

CY2017

us-gaap

Payments For Proceeds From Loans And Leases

PaymentsForProceedsFromLoansAndLeases

78232000

USD

CY2016

us-gaap

Payments For Proceeds From Loans And Leases

PaymentsForProceedsFromLoansAndLeases

621605000

USD

CY2018

us-gaap

Payments For Proceeds From Derivative Instrument Investing Activities

PaymentsForProceedsFromDerivativeInstrumentInvestingActivities

114417000

USD

CY2017

us-gaap

Payments For Proceeds From Derivative Instrument Investing Activities

PaymentsForProceedsFromDerivativeInstrumentInvestingActivities

-479409000

USD

CY2016

us-gaap

Payments For Proceeds From Derivative Instrument Investing Activities

PaymentsForProceedsFromDerivativeInstrumentInvestingActivities

103668000

USD

CY2018

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

175755000

USD

CY2017

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

0

USD

CY2016

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

-56017000

USD

CY2018

us-gaap

Proceeds From Sale Of Productive Assets

ProceedsFromSaleOfProductiveAssets

308762000

USD

CY2017

us-gaap

Proceeds From Sale Of Productive Assets

ProceedsFromSaleOfProductiveAssets

274029000

USD

CY2016

us-gaap

Proceeds From Sale Of Productive Assets

ProceedsFromSaleOfProductiveAssets

198922000

USD

CY2018

us-gaap

Payments To Acquire Productive Assets

PaymentsToAcquireProductiveAssets

345082000

USD

CY2017

us-gaap

Payments To Acquire Productive Assets

PaymentsToAcquireProductiveAssets

250783000

USD

CY2016

us-gaap

Payments To Acquire Productive Assets

PaymentsToAcquireProductiveAssets

199802000

USD

CY2018

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-1807631000

USD

CY2017

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

739556000

USD

CY2016

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-286007000

USD

CY2018

bokf

Net Change In Demand Deposits Transaction Deposits And Savings Accounts

NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts

-13870000

USD

CY2017

bokf

Net Change In Demand Deposits Transaction Deposits And Savings Accounts

NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts

-563406000

USD

CY2016

bokf

Net Change In Demand Deposits Transaction Deposits And Savings Accounts

NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts

1277285000

USD

CY2018

us-gaap

Increase Decrease In Time Deposits

IncreaseDecreaseInTimeDeposits

-73089000

USD

CY2017

us-gaap

Increase Decrease In Time Deposits

IncreaseDecreaseInTimeDeposits

-123384000

USD

CY2016

us-gaap

Increase Decrease In Time Deposits

IncreaseDecreaseInTimeDeposits

-216084000

USD

CY2018

us-gaap

Proceeds From Repayments Of Debt

ProceedsFromRepaymentsOfDebt

1295484000

USD

CY2017

us-gaap

Proceeds From Repayments Of Debt

ProceedsFromRepaymentsOfDebt

-10909000

USD

CY2016

us-gaap

Proceeds From Repayments Of Debt

ProceedsFromRepaymentsOfDebt

-606476000

USD

CY2018

us-gaap

Repayments Of Subordinated Debt

RepaymentsOfSubordinatedDebt

0

USD

CY2017

us-gaap

Repayments Of Subordinated Debt

RepaymentsOfSubordinatedDebt

0

USD

CY2016

us-gaap

Repayments Of Subordinated Debt

RepaymentsOfSubordinatedDebt

226550000

USD

CY2018

us-gaap

Proceeds From Issuance Of Subordinated Long Term Debt

ProceedsFromIssuanceOfSubordinatedLongTermDebt

0

USD

CY2017

us-gaap

Proceeds From Issuance Of Subordinated Long Term Debt

ProceedsFromIssuanceOfSubordinatedLongTermDebt

0

USD

CY2016

us-gaap

Proceeds From Issuance Of Subordinated Long Term Debt

ProceedsFromIssuanceOfSubordinatedLongTermDebt

144615000

USD

CY2018

us-gaap

Proceeds From Payments For Other Financing Activities

ProceedsFromPaymentsForOtherFinancingActivities

-41319000

USD

CY2017

us-gaap

Proceeds From Payments For Other Financing Activities

ProceedsFromPaymentsForOtherFinancingActivities

144690000

USD

CY2016

us-gaap

Proceeds From Payments For Other Financing Activities

ProceedsFromPaymentsForOtherFinancingActivities

-10389000

USD

CY2018

us-gaap

Proceeds From Issuance Of Common Stock

ProceedsFromIssuanceOfCommonStock

-88000

USD

CY2017

us-gaap

Proceeds From Issuance Of Common Stock

ProceedsFromIssuanceOfCommonStock

4368000

USD

CY2016

us-gaap

Proceeds From Issuance Of Common Stock

ProceedsFromIssuanceOfCommonStock

12455000

USD

CY2018

bokf

Net Change In Derivative Margin Accounts

NetChangeInDerivativeMarginAccounts

85466000

USD

CY2017

bokf

Net Change In Derivative Margin Accounts

NetChangeInDerivativeMarginAccounts

-17726000

USD

CY2016

bokf

Net Change In Derivative Margin Accounts

NetChangeInDerivativeMarginAccounts

-28806000

USD

CY2018

us-gaap

Payments For Proceeds From Derivative Instrument Financing Activities

PaymentsForProceedsFromDerivativeInstrumentFinancingActivities

-114076000

USD

CY2017

us-gaap

Payments For Proceeds From Derivative Instrument Financing Activities

PaymentsForProceedsFromDerivativeInstrumentFinancingActivities

485119000

USD

CY2016

us-gaap

Payments For Proceeds From Derivative Instrument Financing Activities

PaymentsForProceedsFromDerivativeInstrumentFinancingActivities

-106051000

USD

CY2018

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

53465000

USD

CY2017

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

7403000

USD

CY2016

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

66792000

USD

CY2018

us-gaap

Payments Of Dividends Common Stock

PaymentsOfDividendsCommonStock

127188000

USD

CY2017

us-gaap

Payments Of Dividends Common Stock

PaymentsOfDividendsCommonStock

116041000

USD

CY2016

us-gaap

Payments Of Dividends Common Stock

PaymentsOfDividendsCommonStock

113455000

USD

CY2018

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

1186007000

USD

CY2017

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-1174930000

USD

CY2016

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

271854000

USD

CY2018

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-1173630000

USD

CY2017

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-220443000

USD

CY2016

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-106102000

USD

CY2017Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2317054000

USD

CY2016Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2537497000

USD

CY2015Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2643599000

USD

CY2018Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

1143424000

USD

CY2016Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2537497000

USD

CY2018

us-gaap

Interest Paid Net

InterestPaidNet

243121000

USD

CY2017

us-gaap

Interest Paid Net

InterestPaidNet

127513000

USD

CY2016

us-gaap

Interest Paid Net

InterestPaidNet

82876000

USD

CY2017Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2317054000

USD

CY2018

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

92291000

USD

CY2017

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

121697000

USD

CY2016

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

79883000

USD

CY2018

us-gaap

Transfer To Other Real Estate

TransferToOtherRealEstate

9880000

USD

CY2017

us-gaap

Transfer To Other Real Estate

TransferToOtherRealEstate

7367000

USD

CY2016

us-gaap

Transfer To Other Real Estate

TransferToOtherRealEstate

36391000

USD

CY2018

bokf

Increase In Us Government Guaranteed Loans Eligible For Repurchase

IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase

100238000

USD

CY2017

bokf

Increase In Us Government Guaranteed Loans Eligible For Repurchase

IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase

148107000

USD

CY2016

bokf

Increase In Us Government Guaranteed Loans Eligible For Repurchase

IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase

120406000

USD

CY2018

bokf

Conveyance Of Other Real Estate Owned Guaranteed By Us Govt

ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt

38216000

USD

CY2017

bokf

Conveyance Of Other Real Estate Owned Guaranteed By Us Govt

ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt

40528000

USD

CY2016

bokf

Conveyance Of Other Real Estate Owned Guaranteed By Us Govt

ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt

68873000

USD

CY2018

us-gaap

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

CY2018

us-gaap

Nature Of Operations

NatureOfOperations

Nature of Operations<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">BOK Financial, through its subsidiaries, provides a wide range of financial services to commercial and industrial customers, other financial institutions, municipalities, and consumers. These services include depository and cash management; lending and lease financing; mortgage banking; securities brokerage, trading and underwriting; and personal and corporate trust.</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">BOKF, NA operates as Bank of Oklahoma primarily in the Tulsa and Oklahoma City metropolitan areas of the state of Oklahoma and Bank of Texas primarily in the Dallas, Fort Worth and Houston metropolitan areas of the state of Texas. In addition, BOKF, NA does business as Bank of Albuquerque in Albuquerque, New Mexico; Colorado State Bank and Trust in Denver, Colorado; Bank of Arizona in Phoenix, Arizona; Mobank in Kansas City, Missouri/Kansas and Bank of Arkansas in Northwest Arkansas. BOKF, NA also operates the TransFund electronic funds network, Cavanal Hill Investment Management, and BOK Financial Asset Management, Inc.</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">On October 1, 2018, BOK Financial acquired CoBiz Financial, Inc. and CoBiz Bank, its wholly owned subsidiary. CoBiz Financial has been merged into BOK Financial. CoBiz Bank will be merged into BOKF, NA in the first quarter of 2019.</span></div><br/>

CY2018

us-gaap

Use Of Estimates

UseOfEstimates

Use of Estimates<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div>Preparation of BOK Financial's Consolidated Financial Statements requires management to make estimates of future economic activities, including loan collectability, prepayments and cash flows from customer accounts. These estimates are based upon current conditions and information available to management. Actual results may differ significantly from these estimates.

CY2018

bokf

Maturity Of Federal Funds Sold Considered Cash Equivalents

MaturityOfFederalFundsSoldConsideredCashEquivalents

P1D

CY2018

bokf

Maturity Of Resell Agreement Considered Cash Equivalents Minimum

MaturityOfResellAgreementConsideredCashEquivalentsMinimum

P1D

CY2018

bokf

Maturity Of Resell Agreements Considered Cash Equivalents Maximum

MaturityOfResellAgreementsConsideredCashEquivalentsMaximum

P30D

CY2018

bokf

Loans Number Of Days Past Due For Non Risk Graded Loan To Be Placed On Nonaccruing Status

LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus

P90D

CY2018

bokf

Loans Number Of Days After Notification Of Chapter7 Bankruptcy Non Risk Graded Loan Is Placed On Nonaccruing Status

LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus

P60D

CY2018

bokf

Minimum No Of Days After Which Past Due Non Risk Graded Loans Are Charged Off

MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff

P60D

CY2018

bokf

Max No Of Days After Which Past Due Non Risk Graded Loans Are Charged Off

MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff

P180D

CY2018

bokf

Loans Number Of Days After Notification Of Chapter7 Bankruptcy Non Risk Graded Loan Is Charged Off

LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff

P60D

CY2018Q4

us-gaap

Cumulative Effect Of New Accounting Principle In Period Of Adoption

CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption

2700000

USD

CY2018

bokf

Increaseofreportedrightofuseassetsandliabilities

137000000

USD

CY2018Q4

us-gaap

Trading Securities Debt

TradingSecuritiesDebt

1956923000

USD

CY2018Q4

bokf

Trading Securities Net Unrealized Gains Losses

TradingSecuritiesNetUnrealizedGainsLosses

10969000

USD

CY2017Q4

us-gaap

Trading Securities Debt

TradingSecuritiesDebt

462676000

USD

CY2017Q4

bokf

Trading Securities Net Unrealized Gains Losses

TradingSecuritiesNetUnrealizedGainsLosses

-448000

USD

CY2018Q4

us-gaap

Held To Maturity Securities

HeldToMaturitySecurities

355187000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Fair Value

HeldToMaturitySecuritiesFairValue

367298000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Accumulated Unrecognized Holding Gain

HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain

14408000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Accumulated Unrecognized Holding Loss

HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss

2297000

USD

CY2017Q4

us-gaap

Held To Maturity Securities

HeldToMaturitySecurities

461793000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Fair Value

HeldToMaturitySecuritiesFairValue

480035000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Accumulated Unrecognized Holding Gain

HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain

20508000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Accumulated Unrecognized Holding Loss

HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss

2266000

USD

CY2018Q4

us-gaap

Held To Maturity Securities

HeldToMaturitySecurities

355187000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Fair Value

HeldToMaturitySecuritiesFairValue

367298000

USD

CY2018Q4

bokf

Held To Maturity Securities Debt Maturities Nominal Yield

HeldToMaturitySecuritiesDebtMaturitiesNominalYield

0.0465

CY2018Q4

us-gaap

Available For Sale Debt Securities Amortized Cost Basis

AvailableForSaleDebtSecuritiesAmortizedCostBasis

8952391000

USD

CY2018Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

8857120000

USD

CY2018Q4

us-gaap

Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax

AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

42986000

USD

CY2018Q4

us-gaap

Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax

AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

138257000

USD

CY2018Q4

bokf

Debt Securities Availablefor Sale Securities Other Than Temporary Impairments

DebtSecuritiesAvailableforSaleSecuritiesOtherThanTemporaryImpairments

0

USD

CY2017Q4

us-gaap

Available For Sale Debt Securities Amortized Cost Basis

AvailableForSaleDebtSecuritiesAmortizedCostBasis

8369075000

USD

CY2017Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

8321578000

USD

CY2017Q4

us-gaap

Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax

AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

41519000

USD

CY2017Q4

us-gaap

Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax

AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

88625000

USD

CY2017Q4

bokf

Debt Securities Availablefor Sale Securities Other Than Temporary Impairments

DebtSecuritiesAvailableforSaleSecuritiesOtherThanTemporaryImpairments

391000

USD

CY2018Q4

us-gaap

Available For Sale Debt Securities Amortized Cost Basis

AvailableForSaleDebtSecuritiesAmortizedCostBasis

8952391000

USD

CY2018Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

8857120000

USD

CY2018Q4

bokf

Debt Securities Availableforsale Securities Debt Maturities Nominal Yield

DebtSecuritiesAvailableforsaleSecuritiesDebtMaturitiesNominalYield

0.0237

CY2018

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

745643000

USD

CY2017

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

1309215000

USD

CY2016

us-gaap

Proceeds From Sale Of Available For Sale Securities Debt

ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

899381000

USD

CY2018

us-gaap

Debt Securities Available For Sale Realized Gain

DebtSecuritiesAvailableForSaleRealizedGain

7117000

USD

CY2017

us-gaap

Debt Securities Available For Sale Realized Gain

DebtSecuritiesAvailableForSaleRealizedGain

10223000

USD

CY2016

us-gaap

Debt Securities Available For Sale Realized Gain

DebtSecuritiesAvailableForSaleRealizedGain

11696000

USD

CY2018

us-gaap

Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment

DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

9918000

USD

CY2017

us-gaap

Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment

DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

5795000

USD

CY2016

us-gaap

Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment

DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment

21000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

-713000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

1722000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

4542000

USD

CY2018Q4

us-gaap

Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value

PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue

9100000000

USD

CY2017Q4

us-gaap

Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value

PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue

7300000000

USD

CY2018Q4

us-gaap

Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions

HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions

146

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

31627000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

133000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

94802000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

2164000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue

126429000

USD

CY2018Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss

2297000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position Number Of Positions

DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions

490

CY2018Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

700064000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

1615000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

5631803000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

136642000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position

DebtSecuritiesAvailableForSaleUnrealizedLossPosition

6331867000

USD

CY2018Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss

DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss

138257000

USD

CY2017Q4

us-gaap

Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions

HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions

150

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

166051000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

1881000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

12265000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

385000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Fair Value

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue

178316000

USD

CY2017Q4

us-gaap

Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss

HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss

2266000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position Number Of Positions

DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions

534

CY2017Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

3773942000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

30648000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

2118360000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

58368000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position

DebtSecuritiesAvailableForSaleUnrealizedLossPosition

5892302000

USD

CY2017Q4

us-gaap

Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss

DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss

89016000

USD

CY2018

us-gaap

Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings

OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings

0

USD

CY2017

us-gaap

Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings

OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings

0

USD

CY2018Q4

us-gaap

Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held

OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld

45000000

USD

CY2017Q4

us-gaap

Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held

OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld

55000000

USD

CY2018Q4

us-gaap

Loans Receivable With Fixed Rates Of Interest1

LoansReceivableWithFixedRatesOfInterest1

5749373000

USD

CY2018Q4

us-gaap

Loans Receivable With Variable Rates Of Interest1

LoansReceivableWithVariableRatesOfInterest1

15744110000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest

LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest

163247000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2017Q4

us-gaap

Loans Receivable With Fixed Rates Of Interest1

LoansReceivableWithFixedRatesOfInterest1

4529296000

USD

CY2017Q4

us-gaap

Loans Receivable With Variable Rates Of Interest1

LoansReceivableWithVariableRatesOfInterest1

12436254000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest

LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest

187874000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2018Q4

us-gaap

Financing Receivable Recorded Investment90 Days Past Due And Still Accruing

FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing

1338000

USD

CY2017Q4

us-gaap

Financing Receivable Recorded Investment90 Days Past Due And Still Accruing

FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing

633000

USD

CY2018

us-gaap

Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans

LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans

15502000

USD

CY2017

us-gaap

Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans

LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans

16496000

USD

CY2018Q4

us-gaap

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net

CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet

31000000

USD

CY2018Q4

us-gaap

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Outstanding Balance

CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance

47000000

USD

CY2018Q4

us-gaap

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield

CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield

843000

USD

CY2018Q4

us-gaap

Unused Commitments To Extend Credit

UnusedCommitmentsToExtendCredit

12000000000

USD

CY2018Q4

bokf

Outstanding Standby Letters Of Credit

OutstandingStandbyLettersOfCredit

582000000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

230682000

USD

CY2018

us-gaap

Provision For Loan And Lease Losses

ProvisionForLoanAndLeaseLosses

9944000

USD

CY2018

us-gaap

Financing Receivable Allowance For Credit Losses Write Offs

FinancingReceivableAllowanceForCreditLossesWriteOffs

43583000

USD

CY2018

us-gaap

Financing Receivable Allowance For Credit Losses Recovery

FinancingReceivableAllowanceForCreditLossesRecovery

10414000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

207457000

USD

CY2017Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

3734000

USD

CY2018

us-gaap

Provision For Other Credit Losses

ProvisionForOtherCreditLosses

-1944000

USD

CY2018Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

1790000

USD

CY2018

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

8000000

USD

CY2016Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

246159000

USD

CY2017

us-gaap

Provision For Loan And Lease Losses

ProvisionForLoanAndLeaseLosses

510000

USD

CY2017

us-gaap

Financing Receivable Allowance For Credit Losses Write Offs

FinancingReceivableAllowanceForCreditLossesWriteOffs

25599000

USD

CY2017

us-gaap

Financing Receivable Allowance For Credit Losses Recovery

FinancingReceivableAllowanceForCreditLossesRecovery

9612000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

230682000

USD

CY2016Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

11244000

USD

CY2017

us-gaap

Provision For Other Credit Losses

ProvisionForOtherCreditLosses

-7510000

USD

CY2017Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

3734000

USD

CY2017

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

-7000000

USD

CY2015Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

225524000

USD

CY2016

us-gaap

Provision For Loan And Lease Losses

ProvisionForLoanAndLeaseLosses

55467000

USD

CY2016

us-gaap

Financing Receivable Allowance For Credit Losses Write Offs

FinancingReceivableAllowanceForCreditLossesWriteOffs

42588000

USD

CY2016

us-gaap

Financing Receivable Allowance For Credit Losses Recovery

FinancingReceivableAllowanceForCreditLossesRecovery

7756000

USD

CY2016Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

246159000

USD

CY2015Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

1711000

USD

CY2016

us-gaap

Provision For Other Credit Losses

ProvisionForOtherCreditLosses

9533000

USD

CY2016Q4

us-gaap

Valuation Allowances And Reserves Balance

ValuationAllowancesAndReservesBalance

11244000

USD

CY2016

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

65000000

USD

CY2018Q4

us-gaap

Financing Receivable Collectively Evaluated For Impairment

FinancingReceivableCollectivelyEvaluatedForImpairment

21493483000

USD

CY2018Q4

us-gaap

Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment

FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment

180957000

USD

CY2018Q4

us-gaap

Financing Receivable Individually Evaluated For Impairment

FinancingReceivableIndividuallyEvaluatedForImpairment

163247000

USD

CY2018Q4

us-gaap

Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1

FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1

8732000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

207457000

USD

CY2017Q4

us-gaap

Financing Receivable Collectively Evaluated For Impairment

FinancingReceivableCollectivelyEvaluatedForImpairment

16965550000

USD

CY2017Q4

us-gaap

Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment

FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment

199634000

USD

CY2017Q4

us-gaap

Financing Receivable Individually Evaluated For Impairment

FinancingReceivableIndividuallyEvaluatedForImpairment

187874000

USD

CY2017Q4

us-gaap

Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1

FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1

8831000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

230682000

USD

CY2018Q4

bokf

Internally Risk Graded Recorded Investment

InternallyRiskGradedRecordedInvestment

19805403000

USD

CY2018Q4

bokf

Internally Risk Graded Allowance

InternallyRiskGradedAllowance

171272000

USD

CY2018Q4

bokf

Non Graded Recorded Investment

NonGradedRecordedInvestment

1851327000

USD

CY2018Q4

bokf

Non Graded Allowance

NonGradedAllowance

18417000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

207457000

USD

CY2017Q4

bokf

Internally Risk Graded Recorded Investment

InternallyRiskGradedRecordedInvestment

15297889000

USD

CY2017Q4

bokf

Internally Risk Graded Allowance

InternallyRiskGradedAllowance

189412000

USD

CY2017Q4

bokf

Non Graded Recorded Investment

NonGradedRecordedInvestment

1855535000

USD

CY2017Q4

bokf

Non Graded Allowance

NonGradedAllowance

19053000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Allowance

LoansAndLeasesReceivableAllowance

230682000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2018Q4

us-gaap

Impaired Financing Receivable Unpaid Principal Balance

ImpairedFinancingReceivableUnpaidPrincipalBalance

423787000

USD

CY2018Q4

us-gaap

Impaired Financing Receivable Recorded Investment

ImpairedFinancingReceivableRecordedInvestment

346981000

USD

CY2018Q4

us-gaap

Impaired Financing Receivable With No Related Allowance Recorded Investment

ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment

311526000

USD

CY2018Q4

us-gaap

Impaired Financing Receivable With Related Allowance Recorded Investment

ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment

35455000

USD

CY2018Q4

us-gaap

Impaired Financing Receivable Related Allowance

ImpairedFinancingReceivableRelatedAllowance

8732000

USD

CY2018

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

345107000

USD

CY2018

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

8405000

USD

CY2017Q4

us-gaap

Impaired Financing Receivable Unpaid Principal Balance

ImpairedFinancingReceivableUnpaidPrincipalBalance

438459000

USD

CY2017Q4

us-gaap

Impaired Financing Receivable Recorded Investment

ImpairedFinancingReceivableRecordedInvestment

376201000

USD

CY2017Q4

us-gaap

Impaired Financing Receivable With No Related Allowance Recorded Investment

ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment

324867000

USD

CY2017Q4

us-gaap

Impaired Financing Receivable With Related Allowance Recorded Investment

ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment

51334000

USD

CY2017Q4

us-gaap

Impaired Financing Receivable Related Allowance

ImpairedFinancingReceivableRelatedAllowance

8831000

USD

CY2017

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

398161000

USD

CY2017

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

8861000

USD

CY2018Q4

us-gaap

Financing Receivable Modifications Recorded Investment

FinancingReceivableModificationsRecordedInvestment

166000000

USD

CY2018Q4

bokf

Troubled Debt Financing Receivable Modification Performing According To Modified Terms

TroubledDebtFinancingReceivableModificationPerformingAccordingToModifiedTerms

71000000

USD

CY2018

us-gaap

Financing Receivables Impaired Troubled Debt Restructuring Write Down

FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

16100000

USD

CY2017Q4

us-gaap

Financing Receivable Modifications Recorded Investment

FinancingReceivableModificationsRecordedInvestment

126000000

USD

CY2017Q4

bokf

Troubled Debt Financing Receivable Modification Performing According To Modified Terms

TroubledDebtFinancingReceivableModificationPerformingAccordingToModifiedTerms

48000000

USD

CY2017

us-gaap

Financing Receivables Impaired Troubled Debt Restructuring Write Down

FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

117000

USD

CY2018

us-gaap

Financing Receivable Modifications Post Modification Recorded Investment2

FinancingReceivableModificationsPostModificationRecordedInvestment2

75000000

USD

CY2017

us-gaap

Financing Receivable Modifications Post Modification Recorded Investment2

FinancingReceivableModificationsPostModificationRecordedInvestment2

57000000

USD

CY2018Q4

us-gaap

Financing Receivable Recorded Investment Current

FinancingReceivableRecordedInvestmentCurrent

21308989000

USD

CY2018Q4

us-gaap

Financing Receivable Recorded Investment Nonaccrual Status

FinancingReceivableRecordedInvestmentNonaccrualStatus

163247000

USD

CY2018Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

21656730000

USD

CY2017Q4

us-gaap

Financing Receivable Recorded Investment Current

FinancingReceivableRecordedInvestmentCurrent

16770208000

USD

CY2017Q4

us-gaap

Financing Receivable Recorded Investment Nonaccrual Status

FinancingReceivableRecordedInvestmentNonaccrualStatus

187874000

USD

CY2017Q4

us-gaap

Loans And Leases Receivable Gross Carrying Amount

LoansAndLeasesReceivableGrossCarryingAmount

17153424000

USD

CY2018Q4

us-gaap

Property Plant And Equipment Gross

PropertyPlantAndEquipmentGross

645017000

USD

CY2017Q4

us-gaap

Property Plant And Equipment Gross

PropertyPlantAndEquipmentGross

755824000

USD

CY2018Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

314984000

USD

CY2017Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

438489000

USD

CY2018Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

330033000

USD

CY2017Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

317335000

USD

CY2018

us-gaap

Depreciation

51000000

USD

CY2017

us-gaap

Depreciation

48000000

USD

CY2016

us-gaap

Depreciation

40000000

USD

CY2018Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

134849000

USD

CY2017Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

28658000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense Next Twelve Months

FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

20481000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense Year Two

FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

19196000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense Year Three

FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

17499000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense Year Four

FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

15219000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense Year Five

FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

13344000

USD

CY2018Q4

us-gaap

Finite Lived Intangible Assets Amortization Expense After Year Five

FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

49110000

USD

CY2018Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

134849000

USD

CY2016Q4

us-gaap

Goodwill

448899000

USD

CY2017

us-gaap

Goodwill Acquired During Period

GoodwillAcquiredDuringPeriod

4301000

USD

CY2017

us-gaap

Goodwill Written Off Related To Sale Of Business Unit

GoodwillWrittenOffRelatedToSaleOfBusinessUnit

5244000

USD

CY2017

us-gaap

Goodwill Purchase Accounting Adjustments

GoodwillPurchaseAccountingAdjustments

-526000

USD

CY2017Q4

us-gaap

Goodwill

447430000

USD

CY2018

us-gaap

Goodwill Acquired During Period

GoodwillAcquiredDuringPeriod

601833000

USD

CY2018Q4

us-gaap

Goodwill

1049263000

USD

CY2016

bokf

Mortgage Servicing Fees

MortgageServicingFees

64286000

USD

CY2018

bokf

Mortgage Banking Revenue

MortgageBankingRevenue

97787000

USD

CY2017

bokf

Mortgage Banking Revenue

MortgageBankingRevenue

104719000

USD

CY2016

bokf

Mortgage Banking Revenue

MortgageBankingRevenue

133914000

USD

CY2018Q4

bokf

Residential Mortgage Loans Held For Sale Unpaid Principal Balance Gross

ResidentialMortgageLoansHeldForSaleUnpaidPrincipalBalanceGross

145057000

USD

CY2018Q4

bokf

Fair Valueof Residential Mortgage Loans Heldfor Sale

FairValueofResidentialMortgageLoansHeldforSale

146971000

USD

CY2017Q4

bokf

Residential Mortgage Loans Held For Sale Unpaid Principal Balance Gross

ResidentialMortgageLoansHeldForSaleUnpaidPrincipalBalanceGross

212525000

USD

CY2017Q4

bokf

Fair Valueof Residential Mortgage Loans Heldfor Sale

FairValueofResidentialMortgageLoansHeldforSale

215113000

USD

CY2018Q4

us-gaap

Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage

LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage

149221000

USD

CY2017Q4

us-gaap

Loans Receivable Held For Sale Net Not Part Of Disposal Group Mortgage

LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage

221378000

USD

CY2018

us-gaap

Gain Loss On Sale Of Mortgage Loans

GainLossOnSaleOfMortgageLoans

36379000

USD

CY2017

us-gaap

Gain Loss On Sale Of Mortgage Loans

GainLossOnSaleOfMortgageLoans

45128000

USD

CY2016

us-gaap

Gain Loss On Sale Of Mortgage Loans

GainLossOnSaleOfMortgageLoans

68947000

USD

CY2018

bokf

Netchangeinunrealizedgainonmortgageloansheldforsale

-674000

USD

CY2017

bokf

Netchangeinunrealizedgainonmortgageloansheldforsale

2031000

USD

CY2016

bokf

Netchangeinunrealizedgainonmortgageloansheldforsale

-5311000

USD

CY2018

bokf

Changeinfairvalueofmortgageloancommitments

-1145000

USD

CY2017

bokf

Changeinfairvalueofmortgageloancommitments

-3210000

USD

CY2016

bokf

Changeinfairvalueofmortgageloancommitments

1599000

USD

CY2018

bokf

Changeinthefairvalueofforwardsalescommitments

-2870000

USD

CY2017

bokf

Changeinthefairvalueofforwardsalescommitments

-5451000

USD

CY2016

bokf

Changeinthefairvalueofforwardsalescommitments

4393000

USD

CY2018

bokf

Mortgage Production Revenue

MortgageProductionRevenue

31690000

USD

CY2017

bokf

Mortgage Production Revenue

MortgageProductionRevenue

38498000

USD

CY2016

bokf

Mortgage Production Revenue

MortgageProductionRevenue

69628000

USD

CY2018

bokf

Mortgage Servicing Fees

MortgageServicingFees

66097000

USD

CY2017

bokf

Mortgage Servicing Fees

MortgageServicingFees

66221000

USD

CY2018Q4

bokf

Residential Mortgage Loans Serviced Number Of Loans

ResidentialMortgageLoansServicedNumberOfLoans

132463000

CY2017Q4

bokf

Residential Mortgage Loans Serviced Number Of Loans

ResidentialMortgageLoansServicedNumberOfLoans

136528000

CY2016Q4

bokf

Residential Mortgage Loans Serviced Number Of Loans

ResidentialMortgageLoansServicedNumberOfLoans

139340000

CY2018Q4

bokf

Residential Mortgage Loans Serviced Outstanding Principal

ResidentialMortgageLoansServicedOutstandingPrincipal

21658335000

USD

CY2017Q4

bokf

Residential Mortgage Loans Serviced Outstanding Principal

ResidentialMortgageLoansServicedOutstandingPrincipal

22046632000

USD

CY2016Q4

bokf

Residential Mortgage Loans Serviced Outstanding Principal

ResidentialMortgageLoansServicedOutstandingPrincipal

21997568000

USD

CY2018Q4

bokf

Weighted Average Interest Rateof Loans Servicedfor Others

WeightedAverageInterestRateofLoansServicedforOthers

0.0399

CY2017Q4

bokf

Weighted Average Interest Rateof Loans Servicedfor Others

WeightedAverageInterestRateofLoansServicedforOthers

0.0394

CY2016Q4

bokf

Weighted Average Interest Rateof Loans Servicedfor Others

WeightedAverageInterestRateofLoansServicedforOthers

0.0397

CY2018

bokf

Residential Mortgage Loans Serviced Weighted Average Remaining Term

ResidentialMortgageLoansServicedWeightedAverageRemainingTerm

P293M

CY2017

bokf

Residential Mortgage Loans Serviced Weighted Average Remaining Term

ResidentialMortgageLoansServicedWeightedAverageRemainingTerm

P297M

CY2016

bokf

Residential Mortgage Loans Serviced Weighted Average Remaining Term

ResidentialMortgageLoansServicedWeightedAverageRemainingTerm

P301M

CY2015Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

218605000

USD

CY2016

us-gaap

Servicing Asset At Fair Value Additions

ServicingAssetAtFairValueAdditions

71405000

USD

CY2016

bokf

Change In Fair Value Due To Loan Runoff

ChangeInFairValueDueToLoanRunoff

-40744000

USD

CY2016

us-gaap

Asset At Fair Value Changes In Fair Value Resulting From Changes In Assumptions

AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions

-2193000

USD

CY2016Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

247073000

USD

CY2017

us-gaap

Servicing Asset At Fair Value Additions

ServicingAssetAtFairValueAdditions

39149000

USD

CY2017

bokf

Change In Fair Value Due To Loan Runoff

ChangeInFairValueDueToLoanRunoff

-33527000

USD

CY2017

us-gaap

Asset At Fair Value Changes In Fair Value Resulting From Changes In Assumptions

AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions

172000

USD

CY2017Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

252867000

USD

CY2018

us-gaap

Servicing Asset At Fair Value Additions

ServicingAssetAtFairValueAdditions

35247000

USD

CY2018

bokf

Change In Fair Value Due To Loan Runoff

ChangeInFairValueDueToLoanRunoff

-33528000

USD

CY2018

us-gaap

Asset At Fair Value Changes In Fair Value Resulting From Changes In Assumptions

AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions

4668000

USD

CY2018Q4

us-gaap

Servicing Asset At Fair Value Amount

ServicingAssetAtFairValueAmount

259254000

USD

CY2018

us-gaap

Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate

ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate

0.0990

CY2017

us-gaap

Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate

ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate

0.0984

CY2018Q4

bokf

Primarysecondarymortgageratespread

105

CY2017Q4

bokf

Primarysecondarymortgageratespread

105

CY2018

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Escrow Earnings Rate

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate

0.0257

CY2017

bokf

Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Escrow Earnings Rate

ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate

0.0224

CY2018Q4

bokf

Loans Serviced For Others Current

LoansServicedForOthersCurrent

21188078000

USD

CY2018Q4

bokf

Loans Serviced For Others30 To59 Days Past Due

LoansServicedForOthers30To59DaysPastDue

326636000

USD

CY2018Q4

bokf

Loans Serviced For Others60 To89 Days Past Due

LoansServicedForOthers60To89DaysPastDue

79657000

USD

CY2018Q4

bokf

Loans Serviced For Otherst Equal To Greater Than90 Days Past Due

LoansServicedForOtherstEqualToGreaterThan90DaysPastDue

63964000

USD

CY2018Q4

bokf

Loans Serviced For Others

LoansServicedForOthers

21658335000

USD

CY2018

us-gaap

Interest Expense Demand Deposit Accounts

InterestExpenseDemandDepositAccounts

65859000

USD

CY2017

us-gaap

Interest Expense Demand Deposit Accounts

InterestExpenseDemandDepositAccounts

28627000

USD

CY2016

us-gaap

Interest Expense Demand Deposit Accounts

InterestExpenseDemandDepositAccounts

13906000

USD

CY2018

us-gaap

Interest Expense Savings Deposits

InterestExpenseSavingsDeposits

439000

USD

CY2017

us-gaap

Interest Expense Savings Deposits

InterestExpenseSavingsDeposits

359000

USD

CY2016

us-gaap

Interest Expense Savings Deposits

InterestExpenseSavingsDeposits

386000

USD

CY2018

us-gaap

Interest Expense Time Deposits Less Than100000

InterestExpenseTimeDepositsLessThan100000

5751000

USD

CY2017

us-gaap

Interest Expense Time Deposits Less Than100000

InterestExpenseTimeDepositsLessThan100000

7702000

USD

CY2016

us-gaap

Interest Expense Time Deposits Less Than100000

InterestExpenseTimeDepositsLessThan100000

8776000

USD

CY2018

us-gaap

Interest Expense Time Deposits100000 Or More

InterestExpenseTimeDeposits100000OrMore

19739000

USD

CY2017

us-gaap

Interest Expense Time Deposits100000 Or More

InterestExpenseTimeDeposits100000OrMore

12393000

USD

CY2016

us-gaap

Interest Expense Time Deposits100000 Or More

InterestExpenseTimeDeposits100000OrMore

10123000

USD

CY2018

bokf

Interest Expense On Other Time Deposits

InterestExpenseOnOtherTimeDeposits

3729000

USD

CY2017

bokf

Interest Expense On Other Time Deposits

InterestExpenseOnOtherTimeDeposits

4722000

USD

CY2016

bokf

Interest Expense On Other Time Deposits

InterestExpenseOnOtherTimeDeposits

7303000

USD

CY2018

us-gaap

Interest Expense Time Deposits

InterestExpenseTimeDeposits

29219000

USD

CY2017

us-gaap

Interest Expense Time Deposits

InterestExpenseTimeDeposits

24817000

USD

CY2016

us-gaap

Interest Expense Time Deposits

InterestExpenseTimeDeposits

26202000

USD

CY2018

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

95517000

USD

CY2017

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

53803000

USD

CY2016

us-gaap

Interest Expense Deposits

InterestExpenseDeposits

40494000

USD

CY2018Q4

us-gaap

Time Deposits At Or Above Fdic Insurance Limit

TimeDepositsAtOrAboveFDICInsuranceLimit

756000000

USD

CY2017Q4

us-gaap

Time Deposits At Or Above Fdic Insurance Limit

TimeDepositsAtOrAboveFDICInsuranceLimit

797000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities Year One

TimeDepositMaturitiesYearOne

1300000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities Year Two

TimeDepositMaturitiesYearTwo

262000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities Year Three

TimeDepositMaturitiesYearThree

98000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities Year Four

TimeDepositMaturitiesYearFour

115000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities Year Five

TimeDepositMaturitiesYearFive

130000000

USD

CY2018Q4

us-gaap

Time Deposit Maturities After Year Five

TimeDepositMaturitiesAfterYearFive

211000000

USD

CY2018Q4

us-gaap

Deposit Liabilities Reclassified As Loans Receivable1

DepositLiabilitiesReclassifiedAsLoansReceivable1

27000000

USD

CY2017Q4

us-gaap

Deposit Liabilities Reclassified As Loans Receivable1

DepositLiabilitiesReclassifiedAsLoansReceivable1

5900000

USD

CY2018Q4

us-gaap

Long Term Debt

LongTermDebt

7418714000

USD

CY2018

bokf

Debt Average Balance

DebtAverageBalance

7298229000

USD

CY2018

us-gaap

Debt Instrument Interest Rate During Period

DebtInstrumentInterestRateDuringPeriod

0.0203

CY2017Q4

us-gaap

Long Term Debt

LongTermDebt

5854537000

USD

CY2017

bokf

Debt Average Balance

DebtAverageBalance

6559101000

USD

CY2017

us-gaap

Debt Instrument Interest Rate During Period

DebtInstrumentInterestRateDuringPeriod

0.0118

CY2016Q4

us-gaap

Long Term Debt

LongTermDebt

5717302000

USD

CY2016

bokf

Debt Average Balance

DebtAverageBalance

6901856000

USD

CY2016

us-gaap

Debt Instrument Interest Rate During Period

DebtInstrumentInterestRateDuringPeriod

0.0060

CY2018

us-gaap

Schedule Of Repurchase Agreements

ScheduleOfRepurchaseAgreements

Additional information relating to securities sold under agreements to repurchase and related liabilities at <span style="font-family:inherit;font-size:10pt;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;"> is as follows (dollars in thousands):</span><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="16"/></tr><tr><td style="width:52%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:9%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:9%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:10%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:9%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="14" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">December 31, 2018</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Amortized</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Fair</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Repurchase</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Average</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Security Sold/Maturity</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Cost</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Value</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Liability</span><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">1</sup></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Rate</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">U.S. government agency mortgage-backed securities:</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:12px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Overnight</span><span style="font-family:inherit;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">1</sup></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>636,864</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>628,229</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>615,961</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>0.36</span></span></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">%</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:12px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Long-term</span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">%</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Total Agency Securities</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>636,864</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>628,229</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>615,961</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><span>0.36</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">%</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="14" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">December 31, 2017</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Amortized</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Fair</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Repurchase</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Average</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Security Sold/Maturity</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Cost</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Value</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Liability</span><span style="font-family:inherit;font-size:9pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">1</sup></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;font-weight:bold;">Rate</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">U.S. government agency mortgage-backed securities:</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:12px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Overnight</span><span style="font-family:inherit;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">1</sup></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>525,452</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>523,914</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>516,335</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>0.17</span></span></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">%</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:12px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Long-term</span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">%</span></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">Total Agency Securities</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>525,452</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>523,914</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>516,335</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><span>0.17</span></span></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;">%</span></div></td></tr></table></div></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:12px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:8pt;padding-left:0px;"><span style="font-family:inherit;font-size:8pt;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">1</sup> </span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;">BOK Financial maintains control over the securities underlying overnight repurchase agreements and generally transfers control over securities underlying longer-term dealer repurchase agreements to the respective counterparty.</span></div></td></tr></table><br/>

CY2017

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.35

CY2018

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.21

CY2018Q4

us-gaap

Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross

DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross

24441000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross

DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross

12083000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

4434000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

7598000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses

49804000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses

58666000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

9619000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

8102000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

25608000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

12215000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Deferred Income

DeferredTaxAssetsDeferredIncome

9814000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Deferred Income

DeferredTaxAssetsDeferredIncome

9265000

USD

CY2018Q4

bokf

Deferred Tax Assets Purchased Loan Discount

DeferredTaxAssetsPurchasedLoanDiscount

27283000

USD

CY2017Q4

bokf

Deferred Tax Assets Purchased Loan Discount

DeferredTaxAssetsPurchasedLoanDiscount

0

USD

CY2018Q4

us-gaap

Deferred Tax Assets Other

DeferredTaxAssetsOther

31812000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Other

DeferredTaxAssetsOther

30859000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Gross

DeferredTaxAssetsGross

182815000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Gross

DeferredTaxAssetsGross

138788000

USD

CY2018Q4

us-gaap

Deferred Tax Liabilities Property Plant And Equipment

DeferredTaxLiabilitiesPropertyPlantAndEquipment

13901000

USD

CY2017Q4

us-gaap

Deferred Tax Liabilities Property Plant And Equipment

DeferredTaxLiabilitiesPropertyPlantAndEquipment

15817000

USD

CY2018Q4

us-gaap

Deferred Tax Liabilities Mortgage Servicing Rights

DeferredTaxLiabilitiesMortgageServicingRights

61844000

USD

CY2017Q4

us-gaap

Deferred Tax Liabilities Mortgage Servicing Rights

DeferredTaxLiabilitiesMortgageServicingRights

63112000

USD

CY2018Q4

us-gaap

Deferred Tax Liabilities Leasing Arrangements

DeferredTaxLiabilitiesLeasingArrangements

10040000

USD

CY2017Q4

us-gaap

Deferred Tax Liabilities Leasing Arrangements

DeferredTaxLiabilitiesLeasingArrangements

9973000

USD

CY2018Q4

us-gaap

Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets

DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

28620000

USD

CY2017Q4

us-gaap

Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets

DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

0

USD

CY2018Q4

us-gaap

Deferred Tax Liabilities Other

DeferredTaxLiabilitiesOther

32954000

USD

CY2017Q4

us-gaap

Deferred Tax Liabilities Other

DeferredTaxLiabilitiesOther

34880000

USD

CY2018Q4

us-gaap

Deferred Income Tax Liabilities

DeferredIncomeTaxLiabilities

147359000

USD

CY2017Q4

us-gaap

Deferred Income Tax Liabilities

DeferredIncomeTaxLiabilities

123782000

USD

CY2018Q4

us-gaap

Deferred Tax Assets Liabilities Net

DeferredTaxAssetsLiabilitiesNet

35456000

USD

CY2017Q4

us-gaap

Deferred Tax Assets Liabilities Net

DeferredTaxAssetsLiabilitiesNet

15006000

USD

CY2016

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

6478000

USD

CY2018

us-gaap

Current Federal Tax Expense Benefit

CurrentFederalTaxExpenseBenefit

103748000

USD

CY2017

us-gaap

Current Federal Tax Expense Benefit

CurrentFederalTaxExpenseBenefit

141607000

USD

CY2016

us-gaap

Current Federal Tax Expense Benefit

CurrentFederalTaxExpenseBenefit

107379000

USD

CY2018

us-gaap

Current State And Local Tax Expense Benefit

CurrentStateAndLocalTaxExpenseBenefit

15253000

USD

CY2017

us-gaap

Current State And Local Tax Expense Benefit

CurrentStateAndLocalTaxExpenseBenefit

14592000

USD

CY2016

us-gaap

Current State And Local Tax Expense Benefit

CurrentStateAndLocalTaxExpenseBenefit

11028000

USD

CY2018

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

119001000

USD

CY2017

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

156199000

USD

CY2016

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

118407000

USD

CY2018

us-gaap

Deferred Federal Income Tax Expense Benefit

DeferredFederalIncomeTaxExpenseBenefit

-190000

USD

CY2017

us-gaap

Deferred Federal Income Tax Expense Benefit

DeferredFederalIncomeTaxExpenseBenefit

25525000

USD

CY2016

us-gaap

Deferred Federal Income Tax Expense Benefit

DeferredFederalIncomeTaxExpenseBenefit

-11340000

USD

CY2018

us-gaap

Deferred State And Local Income Tax Expense Benefit

DeferredStateAndLocalIncomeTaxExpenseBenefit

250000

USD

CY2017

us-gaap

Deferred State And Local Income Tax Expense Benefit

DeferredStateAndLocalIncomeTaxExpenseBenefit

869000

USD

CY2016

us-gaap

Deferred State And Local Income Tax Expense Benefit

DeferredStateAndLocalIncomeTaxExpenseBenefit

-690000

USD

CY2018

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

60000

USD

CY2017

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

26394000

USD

CY2016

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

-12030000

USD

CY2018

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

119061000

USD

CY2017

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

182593000

USD

CY2016

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

106377000

USD

CY2018

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

118752000

USD

CY2017

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

181397000

USD

CY2016

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

118530000

USD

CY2018

us-gaap

Income Tax Reconciliation Tax Exempt Income

IncomeTaxReconciliationTaxExemptIncome

8311000

USD

CY2017

us-gaap

Income Tax Reconciliation Tax Exempt Income

IncomeTaxReconciliationTaxExemptIncome

12402000

USD

CY2016

us-gaap

Income Tax Reconciliation Tax Exempt Income

IncomeTaxReconciliationTaxExemptIncome

10544000

USD

CY2018

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

12430000

USD

CY2017

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

10701000

USD

CY2018

us-gaap

Income Tax Reconciliation Tax Credits Other

IncomeTaxReconciliationTaxCreditsOther

4559000

USD

CY2017

us-gaap

Income Tax Reconciliation Tax Credits Other

IncomeTaxReconciliationTaxCreditsOther

6811000

USD

CY2016

us-gaap

Income Tax Reconciliation Tax Credits Other

IncomeTaxReconciliationTaxCreditsOther

6256000

USD

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

-2105000

USD

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

-2817000

USD

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

0

USD

CY2018

us-gaap

Income Tax Reconciliation Change In Enacted Tax Rate

IncomeTaxReconciliationChangeInEnactedTaxRate

-1728000

USD

CY2017

us-gaap

Income Tax Reconciliation Change In Enacted Tax Rate

IncomeTaxReconciliationChangeInEnactedTaxRate

11672000

USD

CY2016

us-gaap

Income Tax Reconciliation Change In Enacted Tax Rate

IncomeTaxReconciliationChangeInEnactedTaxRate

0

USD

CY2018

us-gaap

Income Tax Reconciliation Nondeductible Expense Other

IncomeTaxReconciliationNondeductibleExpenseOther

3099000

USD

CY2017

us-gaap

Income Tax Reconciliation Nondeductible Expense Other

IncomeTaxReconciliationNondeductibleExpenseOther

0

USD

CY2016

us-gaap

Income Tax Reconciliation Nondeductible Expense Other

IncomeTaxReconciliationNondeductibleExpenseOther

0

USD

CY2018

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

1483000

USD

CY2017

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

853000

USD

CY2016

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

-1831000

USD

CY2018

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

119061000

USD

CY2017

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

182593000

USD

CY2016

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

106377000

USD

CY2018

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.210

CY2017

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.350

CY2016

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.350

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.015

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.024

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.031

CY2018

us-gaap

Effective Income Tax Rate Reconciliation State And Local Income Taxes

EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

0.022

CY2017

us-gaap

Effective Income Tax Rate Reconciliation State And Local Income Taxes

EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

0.020

CY2016

us-gaap

Effective Income Tax Rate Reconciliation State And Local Income Taxes

EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

0.019

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Tax Credits Other

EffectiveIncomeTaxRateReconciliationTaxCreditsOther

0.008

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Tax Credits Other

EffectiveIncomeTaxRateReconciliationTaxCreditsOther

0.013

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Tax Credits Other

EffectiveIncomeTaxRateReconciliationTaxCreditsOther

0.018

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

-0.004

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

-0.005

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent

EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

0

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

-0.003

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

0.023

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

0

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Nondeductible Expense Other

EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther

0.005

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Nondeductible Expense Other

EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther

0

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Nondeductible Expense Other

EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther

0

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

0.004

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

0.001

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

-0.006

CY2018

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.211

CY2017

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.352

CY2016

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.314

CY2017Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

18110000

USD

CY2016Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

15841000

USD

CY2015Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

13232000

USD

CY2018

us-gaap

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions

2649000

USD

CY2017

us-gaap

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions

4645000

USD

CY2016

us-gaap

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions

5640000

USD

CY2018

us-gaap

Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities

UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities

0

USD

CY2017

us-gaap

Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities

UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities

0

USD

CY2016

us-gaap

Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities

UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities

0

USD

CY2018

us-gaap

Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations

UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations

1890000

USD

CY2017

us-gaap

Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations

UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations

2376000

USD

CY2016

us-gaap

Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations

UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations

3031000

USD

CY2018Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

18869000

USD

CY2017Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

18110000

USD

CY2016Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

15841000

USD

CY2018Q4

us-gaap

Unrecognized Tax Benefits That Would Impact Effective Tax Rate

UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

12900000

USD

CY2018

us-gaap

Unrecognized Tax Benefits Income Tax Penalties And Interest Expense

UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense

1700000

USD

CY2017

us-gaap

Unrecognized Tax Benefits Income Tax Penalties And Interest Expense

UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense

1200000

USD

CY2016

us-gaap

Unrecognized Tax Benefits Income Tax Penalties And Interest Expense

UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense

1000000.0

USD

CY2018Q4

us-gaap

Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued

UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

5000000.0

USD

CY2017Q4

us-gaap

Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued

UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

4000000.0

USD

CY2018

bokf

Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination Federal

UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationFederal

3

CY2018

bokf

Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination State Minimum

UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationStateMinimum

3

CY2018

bokf

Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination State Maximum

UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationStateMaximum

6

CY2018Q4

bokf

Defined Benefit Plan Interest Percentage Accrued On Employee Account Balances Rateto Addto Treasury Securities Rate

DefinedBenefitPlanInterestPercentageAccruedOnEmployeeAccountBalancesRatetoAddtoTreasurySecuritiesRate

0.015

CY2018Q4

bokf

Defined Benefit Plan Interest Percentage Accrued On Employee Account Balances Minimum

DefinedBenefitPlanInterestPercentageAccruedOnEmployeeAccountBalancesMinimum

0.030

CY2018Q4

bokf

Defined Benefit Plan Interest Percentage Accrued On Employee Account Balances Maximum

DefinedBenefitPlanInterestPercentageAccruedOnEmployeeAccountBalancesMaximum

0.050

CY2018Q4

bokf

Defined Benefit Plan Quarterly Variable Interest Rate Accrued On Employee Account Balances Minimum

DefinedBenefitPlanQuarterlyVariableInterestRateAccruedOnEmployeeAccountBalancesMinimum

0.0300

CY2018Q4

bokf

Defined Benefit Plan Quarterly Variable Interest Rate Accruedon Employee Account Balances Maximum

DefinedBenefitPlanQuarterlyVariableInterestRateAccruedonEmployeeAccountBalancesMaximum

0.0324

CY2017Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

30897000

USD

CY2016Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

34964000

USD

CY2018

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

973000

USD

CY2017

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

1153000

USD

CY2018

us-gaap

Defined Benefit Plan Actuarial Gain Loss

DefinedBenefitPlanActuarialGainLoss

1417000

USD

CY2017

us-gaap

Defined Benefit Plan Actuarial Gain Loss

DefinedBenefitPlanActuarialGainLoss

-223000

USD

CY2018

us-gaap

Defined Benefit Plan Benefit Obligation Benefits Paid

DefinedBenefitPlanBenefitObligationBenefitsPaid

6033000

USD

CY2017

us-gaap

Defined Benefit Plan Benefit Obligation Benefits Paid

DefinedBenefitPlanBenefitObligationBenefitsPaid

5443000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

24547000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

30897000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

40419000

USD

CY2016Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

41769000

USD

CY2018

us-gaap

Defined Benefit Plan Actual Return On Plan Assets

DefinedBenefitPlanActualReturnOnPlanAssets

-804000

USD

CY2017

us-gaap

Defined Benefit Plan Actual Return On Plan Assets

DefinedBenefitPlanActualReturnOnPlanAssets

4093000

USD

CY2018

us-gaap

Defined Benefit Plan Plan Assets Benefits Paid

DefinedBenefitPlanPlanAssetsBenefitsPaid

6033000

USD

CY2017

us-gaap

Defined Benefit Plan Plan Assets Benefits Paid

DefinedBenefitPlanPlanAssetsBenefitsPaid

5443000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

33582000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

40419000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Funded Status Of Plan

DefinedBenefitPlanFundedStatusOfPlan

9035000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Funded Status Of Plan

DefinedBenefitPlanFundedStatusOfPlan

9522000

USD

CY2018

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

973000

USD

CY2017

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

1153000

USD

CY2018

us-gaap

Defined Benefit Plan Expected Return On Plan Assets

DefinedBenefitPlanExpectedReturnOnPlanAssets

2065000

USD

CY2017

us-gaap

Defined Benefit Plan Expected Return On Plan Assets

DefinedBenefitPlanExpectedReturnOnPlanAssets

2041000

USD

CY2018

us-gaap

Defined Benefit Plan Amortization Of Gains Losses

DefinedBenefitPlanAmortizationOfGainsLosses

-509000

USD

CY2017

us-gaap

Defined Benefit Plan Amortization Of Gains Losses

DefinedBenefitPlanAmortizationOfGainsLosses

-184000

USD

CY2018

us-gaap

Defined Benefit Plan Net Periodic Benefit Cost

DefinedBenefitPlanNetPeriodicBenefitCost

-583000

USD

CY2017

us-gaap

Defined Benefit Plan Net Periodic Benefit Cost

DefinedBenefitPlanNetPeriodicBenefitCost

-704000

USD

CY2018

us-gaap

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate

DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate

0.0410

CY2017

us-gaap

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate

DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate

0.0330

CY2018

us-gaap

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets

DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets

0.0550

CY2017

us-gaap

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets

DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets

0.0550

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months

DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

3562000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Two

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

2257000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Three

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

2194000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Four

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

2299000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Five

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

2495000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter

DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

19175000

USD

CY2018Q4

bokf

Defined Benefit Plan Expected Future Benefit Payments Total

DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal

31982000

USD

CY2018Q4

bokf

Defined Benefit Plan Maximum Tax Deductible Contribution Amount

DefinedBenefitPlanMaximumTaxDeductibleContributionAmount

6600000

USD

CY2018

us-gaap

Defined Contribution Plan Employer Matching Contribution Percent

DefinedContributionPlanEmployerMatchingContributionPercent

0.06

CY2018Q4

bokf

Defined Contribution Plan Employer Matching Ratefor Employee Contributions Minimum

DefinedContributionPlanEmployerMatchingRateforEmployeeContributionsMinimum

0.50

CY2018

bokf

Defined Contribution Plan Minimum Yearsof Servicefor Employeesto Obtain Maximum Employer Matching

DefinedContributionPlanMinimumYearsofServiceforEmployeestoObtainMaximumEmployerMatching

P4Y

CY2018Q4

bokf

Defined Contribution Plan Employer Matching Ratefor Employee Contributions Maximum

DefinedContributionPlanEmployerMatchingRateforEmployeeContributionsMaximum

2

CY2018

bokf

Defined Contribution Plan Maximum Yearsof Servicefor Employeesto Obtain Minimum Employer Matching

DefinedContributionPlanMaximumYearsofServiceforEmployeestoObtainMinimumEmployerMatching

P15Y

CY2018

bokf

Contributions Non Elective Annual Contributions For Qualified Employees

ContributionsNonElectiveAnnualContributionsForQualifiedEmployees

750

USD

CY2018

bokf

Defined Contribution Plan Annual Base Employee Compensationto Qualifyfor Non Elective Employer Contributions Maximum

DefinedContributionPlanAnnualBaseEmployeeCompensationtoQualifyforNonElectiveEmployerContributionsMaximum

40000

USD

CY2018

bokf

Defined Contribution Plan Vesting Periodfor Employer Contributions

DefinedContributionPlanVestingPeriodforEmployerContributions

P5Y

CY2018

us-gaap

Defined Contribution Plan Cost Recognized

DefinedContributionPlanCostRecognized

25100000

USD

CY2017

us-gaap

Defined Contribution Plan Cost Recognized

DefinedContributionPlanCostRecognized

22800000

USD

CY2016

us-gaap

Defined Contribution Plan Cost Recognized

DefinedContributionPlanCostRecognized

22400000

USD

CY2018Q4

bokf

Mutual Funds Managed Net Asset Value Of Units In Mutual Funds

MutualFundsManagedNetAssetValueOfUnitsInMutualFunds

1.00

CY2018Q4

bokf

Mutual Funds Managed Net Asset Value Of Units In Mutual Funds

MutualFundsManagedNetAssetValueOfUnitsInMutualFunds

1.00

CY2018

us-gaap

Operating Leases Rent Expense Net

OperatingLeasesRentExpenseNet

28500000

USD

CY2017

us-gaap

Operating Leases Rent Expense Net

OperatingLeasesRentExpenseNet

27500000

USD

CY2016

us-gaap

Operating Leases Rent Expense Net

OperatingLeasesRentExpenseNet

25800000

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due Current

OperatingLeasesFutureMinimumPaymentsDueCurrent

25800000

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due In Two Years

OperatingLeasesFutureMinimumPaymentsDueInTwoYears

24800000

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due In Three Years

OperatingLeasesFutureMinimumPaymentsDueInThreeYears

21300000

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due In Four Years

OperatingLeasesFutureMinimumPaymentsDueInFourYears

15200000

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due In Five Years

OperatingLeasesFutureMinimumPaymentsDueInFiveYears

13000000.0

USD

CY2018Q4

us-gaap

Operating Leases Future Minimum Payments Due Thereafter

OperatingLeasesFutureMinimumPaymentsDueThereafter

78600000

USD

CY2018

bokf

Minimum Average Cash Balance Required To Be Maintained At Federal Reserve By Subsidiary Bank

MinimumAverageCashBalanceRequiredToBeMaintainedAtFederalReserveBySubsidiaryBank

1200000000

USD

CY2017

bokf

Minimum Average Cash Balance Required To Be Maintained At Federal Reserve By Subsidiary Bank

MinimumAverageCashBalanceRequiredToBeMaintainedAtFederalReserveBySubsidiaryBank

1900000000

USD

CY2018Q4

bokf

Common Equity Tier One Capitalto Risk Weighted Assets Minimum Requirement

CommonEquityTierOneCapitaltoRiskWeightedAssetsMinimumRequirement

0.0450

CY2018Q4

bokf

Capital Conservation Buffer Common Equity Tier Oneto Risk Weighted Assets

CapitalConservationBufferCommonEquityTierOnetoRiskWeightedAssets

0.0250

CY2018Q4

bokf

Minimum Capital Requirement Including Capital Conservation Buffer Commonequity Tier Oneto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferCommonequityTierOnetoRiskWeightedAssets

0.0700

CY2018Q4

us-gaap

Common Equity Tier One Capital

CommonEquityTierOneCapital

3356524000

USD

CY2018Q4

us-gaap

Common Equity Tier One Capital Ratio

CommonEquityTierOneCapitalRatio

0.1092

CY2017Q4

us-gaap

Common Equity Tier One Capital

CommonEquityTierOneCapital

3074981000

USD

CY2017Q4

us-gaap

Common Equity Tier One Capital Ratio

CommonEquityTierOneCapitalRatio

0.1205

CY2018Q4

us-gaap

Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets

TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets

0.0600

CY2018Q4

bokf

Capital Conservation Buffer Tier1 Capitalto Risk Weighted Assets

CapitalConservationBufferTier1CapitaltoRiskWeightedAssets

0.0250

CY2018Q4

bokf

Minimum Capital Requirement Including Capital Conservation Buffer Tier Oneto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferTierOnetoRiskWeightedAssets

0.0850

CY2018Q4

us-gaap

Tier One Risk Based Capital

TierOneRiskBasedCapital

3356524000

USD

CY2018Q4

us-gaap

Tier One Risk Based Capital To Risk Weighted Assets

TierOneRiskBasedCapitalToRiskWeightedAssets

0.1092

CY2017Q4

us-gaap

Tier One Risk Based Capital

TierOneRiskBasedCapital

3074981000

USD

CY2017Q4

us-gaap

Tier One Risk Based Capital To Risk Weighted Assets

TierOneRiskBasedCapitalToRiskWeightedAssets

0.1205

CY2018Q4

us-gaap

Capital Required For Capital Adequacy To Risk Weighted Assets

CapitalRequiredForCapitalAdequacyToRiskWeightedAssets

0.0800

CY2018Q4

bokf

Capital Conservation Buffer Total Capitalto Risk Weighted Assets

CapitalConservationBufferTotalCapitaltoRiskWeightedAssets

0.0250

CY2018Q4

bokf

Minimum Capital Requirement Including Capital Conservation Bufferfor Total Capitalto Risk Weighted Assets

MinimumCapitalRequirementIncludingCapitalConservationBufferforTotalCapitaltoRiskWeightedAssets

0.1050

CY2018Q4

us-gaap

Capital

3841684000

USD

CY2018Q4

us-gaap

Capital To Risk Weighted Assets

CapitalToRiskWeightedAssets

0.1250

CY2017Q4

us-gaap

Capital

3455709000

USD

CY2017Q4

us-gaap

Capital To Risk Weighted Assets

CapitalToRiskWeightedAssets

0.1354

CY2018Q4

us-gaap

Tier One Leverage Capital Required For Capital Adequacy To Average Assets

TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets

0.0400

CY2018Q4

bokf

Minimum Capital Requirements Including Capital Conservation Buffer Tier One Capitalto Average Assets

MinimumCapitalRequirementsIncludingCapitalConservationBufferTierOneCapitaltoAverageAssets

0.0400

CY2018Q4

us-gaap

Tier One Leverage Capital

TierOneLeverageCapital

3356524000

USD

CY2018Q4

us-gaap

Tier One Leverage Capital To Average Assets

TierOneLeverageCapitalToAverageAssets

0.0896

CY2017Q4

us-gaap

Tier One Leverage Capital

TierOneLeverageCapital

3074981000

USD

CY2017Q4

us-gaap

Tier One Leverage Capital To Average Assets

TierOneLeverageCapitalToAverageAssets

0.0931

CY2018Q4

bokf

Phasedin Capital Conservation Buffer

PhasedinCapitalConservationBuffer

0.01875

CY2017Q4

bokf

Phasedin Capital Conservation Buffer

PhasedinCapitalConservationBuffer

0.0125

CY2018Q4

bokf

Fully Phased In Capital Conservation Buffer

FullyPhasedInCapitalConservationBuffer

0.0250

CY2015Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

21587000

USD

CY2016

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-41521000

USD

CY2016

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

-112000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

11675000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-53308000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-20754000

USD

CY2016

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-32554000

USD

CY2016Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-10967000

USD

CY2017

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-26152000

USD

CY2017

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

0

USD

CY2017

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

4428000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-30580000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-11923000

USD

CY2017

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-18657000

USD

CY2017

bokf

Tax Cutsand Jobs Act Reclassificationfrom Aoc Ito Retained Earnings Tax Effect

TaxCutsandJobsActReclassificationfromAOCItoRetainedEarningsTaxEffect

-6550000

USD

CY2017Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-36174000

USD

CY2017Q4

us-gaap

Cumulative Effect Of New Accounting Principle In Period Of Adoption

CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption

-2709000

USD

CY2018

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-48010000

USD

CY2018

bokf

Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities

AmortizationOfTransferOfNetUnrealizedGainOnAvailableForSaleSecuritiesToInvestmentSecurities

0

USD

CY2018

us-gaap

Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax

OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

-2801000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Before Tax

OtherComprehensiveIncomeLossBeforeTax

-45209000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Tax

OtherComprehensiveIncomeLossTax

-11507000

USD

CY2018

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

-33702000

USD

CY2018Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-72585000

USD

CY2018

us-gaap

Net Income Loss

NetIncomeLoss

445646000

USD

CY2017

us-gaap

Net Income Loss

NetIncomeLoss

334644000

USD

CY2016

us-gaap

Net Income Loss

NetIncomeLoss

232668000

USD

CY2018

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Basic

UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

3737000

USD

CY2017

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Basic

UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

3561000

USD

CY2016

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Basic

UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

2883000

USD

CY2018

us-gaap

Net Income Loss Available To Common Stockholders Basic

NetIncomeLossAvailableToCommonStockholdersBasic

441909000

USD

CY2017

us-gaap

Net Income Loss Available To Common Stockholders Basic

NetIncomeLossAvailableToCommonStockholdersBasic

331083000

USD

CY2016

us-gaap

Net Income Loss Available To Common Stockholders Basic

NetIncomeLossAvailableToCommonStockholdersBasic

229785000

USD

CY2018

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Diluted

UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted

-1000

USD

CY2017

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Diluted

UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted

-2000

USD

CY2016

us-gaap

Undistributed Earnings Loss Allocated To Participating Securities Diluted

UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted

-1000

USD

CY2018

us-gaap

Net Income Loss Available To Common Stockholders Diluted

NetIncomeLossAvailableToCommonStockholdersDiluted

441910000

USD

CY2017

us-gaap

Net Income Loss Available To Common Stockholders Diluted

NetIncomeLossAvailableToCommonStockholdersDiluted

331085000

USD

CY2016

us-gaap

Net Income Loss Available To Common Stockholders Diluted

NetIncomeLossAvailableToCommonStockholdersDiluted

229786000

USD

CY2018

us-gaap

Weighted Average Number Of Share Outstanding Basic And Diluted

WeightedAverageNumberOfShareOutstandingBasicAndDiluted

67190257

shares

CY2017

us-gaap

Weighted Average Number Of Share Outstanding Basic And Diluted

WeightedAverageNumberOfShareOutstandingBasicAndDiluted

65440832

shares

CY2016

us-gaap

Weighted Average Number Of Share Outstanding Basic And Diluted

WeightedAverageNumberOfShareOutstandingBasicAndDiluted

65901110

shares

CY2018

us-gaap

Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights

IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights

561617

shares

CY2017

us-gaap

Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights

IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights

695468

shares

CY2016

us-gaap

Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights

IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights

815483

shares

CY2018

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

66628640

shares

CY2017

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

64745364

shares

CY2016

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

65085627

shares

CY2018

us-gaap

Incremental Common Shares Attributable To Share Based Payment Arrangements

IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

33633

shares

CY2017

us-gaap

Incremental Common Shares Attributable To Share Based Payment Arrangements

IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

60920

shares

CY2016

us-gaap

Incremental Common Shares Attributable To Share Based Payment Arrangements

IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

58271

shares

CY2018

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

66662273

shares

CY2017

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

64806284

shares

CY2016

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

65143898

shares

CY2018

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

6.63

CY2017

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

5.11

CY2016

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.53

CY2018

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

6.63

CY2017

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

5.11

CY2016

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.53

CY2018

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

0

shares

CY2017

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

0

shares

CY2016

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

0

shares

CY2018

bokf

Nir Expense From External Sources

NirExpenseFromExternalSources

984867000

USD

CY2018

bokf

Ni Rexpensefrominternalsources

NIRexpensefrominternalsources

0

USD

CY2018

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

984867000

USD

CY2018

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

8000000

USD

CY2018

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

976867000

USD

CY2018

us-gaap

Noninterest Income

NoninterestIncome

616784000

USD

CY2018

us-gaap

Noninterest Expense

NoninterestExpense

1028166000

USD

CY2018

bokf

Netdirectcontribution

565485000

USD

CY2018

bokf

Gain Losson Financial Instruments Net

GainLossonFinancialInstrumentsNet

0

USD

CY2018

bokf

Segment Reporting Changein Fair Valueof Mortgage Servicing Rights

SegmentReportingChangeinFairValueofMortgageServicingRights

0

USD

CY2018

us-gaap

Gain Loss On Sales Of Assets And Asset Impairment Charges

GainLossOnSalesOfAssetsAndAssetImpairmentCharges

0

USD

CY2018

bokf

Corporate Expense Allocations

CorporateExpenseAllocations

0

USD

CY2018

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

565485000

USD

CY2018

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

119061000

USD

CY2018

us-gaap

Profit Loss

ProfitLoss

446424000

USD

CY2018

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

778000

USD

CY2018

us-gaap

Net Income Loss

NetIncomeLoss

445646000

USD

CY2018

bokf

Average Assets For Reporting Period

AverageAssetsForReportingPeriod

34937530000

USD

CY2017

bokf

Nir Expense From External Sources

NirExpenseFromExternalSources

841701000

USD

CY2017

bokf

Ni Rexpensefrominternalsources

NIRexpensefrominternalsources

0

USD

CY2017

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

841701000

USD

CY2017

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

-7000000

USD

CY2017

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

848701000

USD

CY2017

us-gaap

Noninterest Income

NoninterestIncome

695094000

USD

CY2017

us-gaap

Noninterest Expense

NoninterestExpense

1025517000

USD

CY2017

bokf

Netdirectcontribution

518278000

USD

CY2017

bokf

Gain Losson Financial Instruments Net

GainLossonFinancialInstrumentsNet

0

USD

CY2017

bokf

Segment Reporting Changein Fair Valueof Mortgage Servicing Rights

SegmentReportingChangeinFairValueofMortgageServicingRights

0

USD

CY2017

us-gaap

Gain Loss On Sales Of Assets And Asset Impairment Charges

GainLossOnSalesOfAssetsAndAssetImpairmentCharges

0

USD

CY2017

bokf

Corporate Expense Allocations

CorporateExpenseAllocations

0

USD

CY2017

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

518278000

USD

CY2017

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

182593000

USD

CY2017

us-gaap

Profit Loss

ProfitLoss

335685000

USD

CY2017

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

1041000

USD

CY2017

us-gaap

Net Income Loss

NetIncomeLoss

334644000

USD

CY2017

bokf

Average Assets For Reporting Period

AverageAssetsForReportingPeriod

32947494000

USD

CY2016

bokf

Nir Expense From External Sources

NirExpenseFromExternalSources

747228000

USD

CY2016

bokf

Ni Rexpensefrominternalsources

NIRexpensefrominternalsources

0

USD

CY2016

us-gaap

Interest Income Expense Net

InterestIncomeExpenseNet

747228000

USD

CY2016

us-gaap

Provision For Loan Lease And Other Losses

ProvisionForLoanLeaseAndOtherLosses

65000000

USD

CY2016

us-gaap

Interest Income Expense After Provision For Loan Loss

InterestIncomeExpenseAfterProvisionForLoanLoss

682228000

USD

CY2016

us-gaap

Noninterest Income

NoninterestIncome

674020000

USD

CY2016

us-gaap

Noninterest Expense

NoninterestExpense

1017590000

USD

CY2016

bokf

Netdirectcontribution

338658000

USD

CY2016

bokf

Gain Losson Financial Instruments Net

GainLossonFinancialInstrumentsNet

0

USD

CY2016

bokf

Segment Reporting Changein Fair Valueof Mortgage Servicing Rights

SegmentReportingChangeinFairValueofMortgageServicingRights

0

USD

CY2016

us-gaap

Gain Loss On Sales Of Assets And Asset Impairment Charges

GainLossOnSalesOfAssetsAndAssetImpairmentCharges

0

USD

CY2016

bokf

Corporate Expense Allocations

CorporateExpenseAllocations

0

USD

CY2016

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

338658000

USD

CY2016

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

106377000

USD

CY2016

us-gaap

Profit Loss

ProfitLoss

232281000

USD

CY2016

us-gaap

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

-387000

USD

CY2016

us-gaap

Net Income Loss

NetIncomeLoss

232668000

USD

CY2016

bokf

Average Assets For Reporting Period

AverageAssetsForReportingPeriod

32278402000

USD

CY2018Q4

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.50

CY2018Q4

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.50

CY2017Q4

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.11

CY2017Q4

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.11

Concept	2018 Q4	2017 Q4	2016 Q4
Revenue
YoY Change
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.80M	$15.30M	$11.80M
YoY Change	22.88%	29.66%	-196.72%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$128.5M	$126.7M	$72.40M
YoY Change	1.42%	75.0%	-17.07%
Income Tax	$21.80M	$42.60M	$22.50M
% Of Pretax Income	16.96%	33.62%	31.08%
Net Earnings	$108.5M	$72.50M	$50.00M
YoY Change	49.66%	45.0%	-16.11%
Net Earnings / Revenue
Basic Earnings Per Share	$1.50	$1.11
Diluted Earnings Per Share	$1.50	$1.11	$771.6K
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding

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$BOKF
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2018 Q4 Form 10-K Financial Statement

#000087535719000011 Filed on March 01, 2019

Income Statement

Balance Sheet

Cashflow Statement

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$BOKF BOK FINANCIAL CORP Stock $bokf

2018 Q4 Form 10-K Financial Statement

#000087535719000011 Filed on March 01, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BOKF
BOK FINANCIAL CORP Stock $bokf