$BOKF
BOK FINANCIAL CORP Stock $bokf

$bokf Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000087535721000013 Filed on February 24, 2021

Income Statement

Concept	2020	2019 Q4	2019
Revenue	$1.269B		$1.532B
YoY Change	-17.16%		24.71%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$135.5M		$125.0M
YoY Change	8.41%		8.87%
% of Gross Profit
Depreciation & Amortization	$54.30M	$25.60M	$51.60M
YoY Change	5.23%	36.17%	0.78%
% of Gross Profit
Operating Expenses	$135.5M		$125.0M
YoY Change	8.41%		8.87%
Operating Profit
YoY Change
Interest Expense	$160.6M		$419.1M
YoY Change	-61.69%		72.06%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$563.9M	$141.0M	$630.9M
YoY Change	-10.62%	9.73%	11.56%
Income Tax	$128.8M	$30.30M	$130.2M
% Of Pretax Income	22.84%	21.49%	20.64%
Net Earnings	$435.0M	$110.4M	$500.8M
YoY Change	-13.13%	1.75%	12.37%
Net Earnings / Revenue	34.28%		32.69%
Basic Earnings Per Share	$6.19		$7.03
Diluted Earnings Per Share	$6.19	$1.570M	$7.03
COMMON SHARES
Basic Shares Outstanding	69.84M shares		70.79M shares
Diluted Shares Outstanding	69.84M shares		70.80M shares

Balance Sheet

Concept	2020	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$1.259B
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	$551.0M	$535.5M	$536.0M
YoY Change	2.8%	62.26%	62.42%
Goodwill		$1.048B
YoY Change		-0.11%
Intangibles		$125.3M
YoY Change		-7.1%
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	$46.67B	$42.17B	$42.17B
YoY Change	10.67%	10.92%	10.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$324.0M	$260.0M	$260.0M
YoY Change	24.62%	34.72%	34.72%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.662B	$3.818B	$3.818B
YoY Change	-56.47%	275.05%	275.05%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$324.0M	$260.0M	$260.0M
YoY Change	24.62%	34.72%	34.72%
LONG-TERM LIABILITIES
Long-Term Debt	$1.959B	$303.0M	$303.0M
YoY Change	546.53%	1.0%	1.0%
Other Long-Term Liabilities	$1.091B	$806.0M	$806.0M
YoY Change	35.36%	14.81%	14.81%
Total Long-Term Liabilities	$3.050B	$1.109B	$1.109B
YoY Change	175.02%	10.68%	10.68%
TOTAL LIABILITIES
Total Short-Term Liabilities	$324.0M	$260.0M	$260.0M
Total Long-Term Liabilities	$3.050B	$1.109B	$1.109B
Total Liabilities	$41.41B	$37.31B	$37.32B
YoY Change	10.96%	11.11%	11.1%
SHAREHOLDERS EQUITY
Retained Earnings		$3.730B
YoY Change		10.69%
Common Stock		$1.351B
YoY Change		1.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$329.9M
YoY Change		65.79%
Treasury Stock Shares		5.179M shares
Shareholders Equity	$5.266B	$4.856B	$4.856B
YoY Change
Total Liabilities & Shareholders Equity	$46.67B	$42.17B	$42.17B
YoY Change	10.67%	10.92%	10.92%

Cashflow Statement

Concept	2020	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	$435.0M	$110.4M	$500.8M
YoY Change	-13.13%	1.75%	12.37%
Depreciation, Depletion And Amortization	$54.30M	$25.60M	$51.60M
YoY Change	5.23%	36.17%	0.78%
Cash From Operating Activities	-$416.3M	$582.8M	-$473.7M
YoY Change	-12.12%	-458.43%	-14.19%
INVESTING ACTIVITIES
Capital Expenditures	-$141.1M	-$76.00M	-$384.6M
YoY Change	-63.31%	-19.75%	11.45%
Acquisitions	$0.00		$0.00
YoY Change			-100.0%
Other Investing Activities	-$2.318B	$311.1M	-$1.939B
YoY Change	19.52%	-145.97%	32.59%
Cash From Investing Activities	-$2.459B	$235.2M	-$2.324B
YoY Change	5.81%	-130.49%	28.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$80.76M		$129.5M
YoY Change	-37.63%		141.8%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$2.797B	-785.7M	$2.913B
YoY Change	-3.98%	-194.53%	145.6%
NET CHANGE
Cash From Operating Activities	-$416.3M	582.8M	-$473.7M
Cash From Investing Activities	-$2.459B	235.2M	-$2.324B
Cash From Financing Activities	$2.797B	-785.7M	$2.913B
Net Change In Cash	-$78.25M	32.30M	$115.4M
YoY Change	-167.81%	-131.42%	-109.83%
FREE CASH FLOW
Cash From Operating Activities	-$416.3M	$582.8M	-$473.7M
Capital Expenditures	-$141.1M	-$76.00M	-$384.6M
Free Cash Flow	-$275.2M	$658.8M	-$89.08M
YoY Change	208.89%	-1070.25%	-56.95%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000875357
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	0-19341
CY2020	dei	Entity Registrant Name EntityRegistrantName	BOK FINANCIAL CORP
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	OK
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	73-1373454
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	Boston Avenue at Second Street
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Tulsa,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	OK
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	74172
CY2020	dei	City Area Code CityAreaCode	918
CY2020	dei	Local Phone Number LocalPhoneNumber	588-6000
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	69577615	shares
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020Q2	dei	Entity Public Float EntityPublicFloat	1800000000	USD
CY2020	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	889507000	USD
CY2019	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1123791000	USD
CY2018	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	891587000	USD
CY2020	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	6397000	USD
CY2019	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	7105000	USD
CY2018	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	8123000	USD
CY2020	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	67689000	USD
CY2019	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	61595000	USD
CY2018	us-gaap	Interest And Dividend Income Securities Trading Or Measured At Fair Value InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue	57531000	USD
CY2020	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	11943000	USD
CY2019	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	13426000	USD
CY2018	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	14775000	USD
CY2020	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	261196000	USD
CY2019	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	254031000	USD
CY2018	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	197317000	USD
CY2020	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	18475000	USD
CY2019	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	32936000	USD
CY2018	bokf	Interest Revenue On Fair Value Option Securities InterestRevenueOnFairValueOptionSecurities	15205000	USD
CY2020	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	10963000	USD
CY2019	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	26860000	USD
CY2018	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	21555000	USD
CY2020	bokf	Interestincome Interestbearingcashandcashequivalents InterestincomeInterestbearingcashandcashequivalents	2830000	USD
CY2019	bokf	Interestincome Interestbearingcashandcashequivalents InterestincomeInterestbearingcashandcashequivalents	12214000	USD
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CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	89996000	USD
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	175538000	USD
CY2018	us-gaap	Interest Expense Deposits InterestExpenseDeposits	95517000	USD
CY2020	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	56616000	USD
CY2019	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	228428000	USD
CY2018	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	138215000	USD
CY2020	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	13944000	USD
CY2019	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	15113000	USD
CY2018	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	9827000	USD
CY2020	us-gaap	Interest Expense InterestExpense	160556000	USD
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CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	984867000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	222592000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8000000	USD
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	885852000	USD
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1068879000	USD
CY2018	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	976867000	USD
CY2020	bokf	Total Fees And Commissions TotalFeesAndCommissions	810320000	USD
CY2019	bokf	Total Fees And Commissions TotalFeesAndCommissions	702201000	USD
CY2018	bokf	Total Fees And Commissions TotalFeesAndCommissions	643176000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	7675000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	9351000	USD
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CY2019	us-gaap	Gain Loss From Price Risk Management Activity GainLossFromPriceRiskManagementActivity	14951000	USD
CY2018	us-gaap	Gain Loss From Price Risk Management Activity GainLossFromPriceRiskManagementActivity	-422000	USD
CY2020	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	53248000	USD
CY2019	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	15787000	USD
CY2018	bokf	Gain On Fair Value Option Securities Net GainOnFairValueOptionSecuritiesNet	-25572000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	79524000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	53517000	USD
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-4668000	USD
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CY2018	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-2801000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	843949000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	694370000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	616784000	USD
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CY2020	bokf	Contributions To Bokf Foundation ContributionsToBokfFoundation	9000000	USD
CY2019	bokf	Contributions To Bokf Foundation ContributionsToBokfFoundation	3000000	USD
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CY2020	us-gaap	Professional Fees ProfessionalFees	53437000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	54861000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	59099000	USD
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CY2018	us-gaap	Occupancy Net OccupancyNet	97981000	USD
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CY2019	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	20906000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	23318000	USD
CY2020	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	135497000	USD
CY2019	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	124983000	USD
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CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9620000	USD
CY2020	bokf	Mortgage Banking Costs MortgageBankingCosts	56711000	USD
CY2019	bokf	Mortgage Banking Costs MortgageBankingCosts	50685000	USD
CY2018	bokf	Mortgage Banking Costs MortgageBankingCosts	46298000	USD
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CY2020	us-gaap	Noninterest Expense NoninterestExpense	1165937000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	1132381000	USD
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CY2019	us-gaap	Profit Loss ProfitLoss	500685000	USD
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CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-73000	USD
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CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.63
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CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69844172	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70802612	shares
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CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.05
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CY2019	us-gaap	Profit Loss ProfitLoss	500685000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	303886000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	235450000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-45209000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	72941000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	57942000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11507000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	230945000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	177508000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33702000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	666016000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	678266000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	678193000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	412722000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	41000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-73000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	778000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	665975000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	411944000	USD
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	798757000	USD
CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	735836000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	381816000	USD
CY2019Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	522985000	USD
CY2020Q4	us-gaap	Trading Securities TradingSecurities	4707975000	USD
CY2019Q4	us-gaap	Trading Securities TradingSecurities	1623921000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	272431000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	314402000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	244843000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	293418000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	13050665000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	11269643000	USD
CY2020Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	114982000	USD
CY2019Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	1098577000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	171391000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	460552000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	252316000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	182271000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	23007520000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	388640000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	210759000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	22618880000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	21540228000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	551308000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	535519000	USD
CY2020Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	245880000	USD
CY2019Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	231811000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1048091000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1048091000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	113436000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	125271000	USD
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	101172000	USD
CY2019Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	201886000	USD
CY2020Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	15060000	USD
CY2019Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	11013000	USD
CY2020Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	90526000	USD
CY2019Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	20359000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	810688000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	323375000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	398758000	USD
CY2019Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	389879000	USD
CY2020Q4	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	62386000	USD
CY2019Q4	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	1020404000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	907218000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	547995000	USD
CY2020Q4	us-gaap	Assets Assets	46671088000	USD
CY2019Q4	us-gaap	Assets Assets	42172021000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	12266338000	USD
CY2019Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	9461291000	USD
CY2020Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	21158422000	USD
CY2019Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	15391752000	USD
CY2020Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	751992000	USD
CY2019Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	550276000	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	1967128000	USD
CY2019Q4	us-gaap	Time Deposits TimeDeposits	2217849000	USD
CY2020Q4	us-gaap	Deposits Deposits	36143880000	USD
CY2019Q4	us-gaap	Deposits Deposits	27621168000	USD
CY2020Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	1662386000	USD
CY2019Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	3818350000	USD
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	1882970000	USD
CY2019Q4	us-gaap	Other Borrowings OtherBorrowings	4527055000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	276005000	USD
CY2019Q4	us-gaap	Subordinated Debt SubordinatedDebt	275923000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	323667000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	259701000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	405779000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	251128000	USD
CY2020Q4	srt	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	257627000	USD
CY2019Q4	srt	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	182547000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	427213000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	372230000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	41379527000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	37308102000	USD
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00006
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00006
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75995205	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75995205	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75758597	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75758597	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	5000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	5000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1368062000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1350995000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3973675000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3729778000	USD
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6357605	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5178999	shares
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	411344000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	329906000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	335868000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	104923000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	5266266000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4855795000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	25295000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	8124000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5291561000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4863919000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	46671088000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	42172021000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	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	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	12809000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	701311000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4443045000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	500685000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	177508000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	129483000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense	1421000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1428000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	15544000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	143496000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2739000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4863919000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4863919000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	435071000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	230945000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	75830000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised Net Of Tax Benefit Expense StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense	675000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	5608000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16392000	USD
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	144437000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17130000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5291561000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	435071000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	500685000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	446424000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	222592000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8000000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	79524000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	53517000	USD
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-4668000	USD
CY2020	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	41598000	USD
CY2019	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	38979000	USD
CY2018	bokf	Changeinfairvalueofmortgageservicingrightsduetoloanrunoff Changeinfairvalueofmortgageservicingrightsduetoloanrunoff	33528000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	59253000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	25936000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-4686000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	16392000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	15544000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	4229000	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	99013000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	95416000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	60843000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-5357000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	16984000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-30945000	USD
CY2020	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	15949000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	583000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-9585000	USD
CY2020	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	114545000	USD
CY2019	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	40402000	USD
CY2018	bokf	Netgainonmortgageloansheldforsale Netgainonmortgageloansheldforsale	35705000	USD
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	3764112000	USD
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	3025930000	USD
CY2018	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	2587297000	USD
CY2020	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	3817475000	USD
CY2019	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	3035600000	USD
CY2018	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	2691144000	USD
CY2020	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	31209000	USD
CY2019	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	35128000	USD
CY2018	bokf	Capitalizedmortgageservicingrights Capitalizedmortgageservicingrights	35247000	USD
CY2020	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	2103931000	USD
CY2019	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	483007000	USD
CY2018	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	1023097000	USD
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-945087000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	740868000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	38346000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1739000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-18955000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-27507000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	8895000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	92463000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-144537000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-416256000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-473679000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-552006000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	46992000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	60128000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	124864000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2695067000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1841069000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1122680000	USD
CY2020	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	4468000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	4575324000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	5245256000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1955172000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	384507000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1211718000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	745643000	USD
CY2020	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	-6357000	USD
CY2019	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	25410000	USD
CY2018	bokf	Change In Amount Receivable On Unsettled Security Transactions ChangeInAmountReceivableOnUnsettledSecurityTransactions	38347000	USD
CY2020	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1103752000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	44414000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1553033000	USD
CY2020	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	121130000	USD
CY2019	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-33566000	USD
CY2018	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	114417000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	175755000	USD
CY2020	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	289161000	USD
CY2019	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	116105000	USD
CY2018	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	18997000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	73135000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	62576000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	289765000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	141134000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	384639000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	345082000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2458835000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2323737000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1807631000	USD
CY2020	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	8773433000	USD
CY2019	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	2252936000	USD
CY2018	bokf	Net Change In Demand Deposits Transaction Deposits And Savings Accounts NetChangeInDemandDepositsTransactionDepositsAndSavingsAccounts	-13870000	USD
CY2020	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-250721000	USD
CY2019	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	104288000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-73089000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-7000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-88000	USD
CY2020	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-5091026000	USD
CY2019	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	1110970000	USD
CY2018	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	1295484000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	63521000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-41651000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-41319000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-4933000	USD
CY2020	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	-600218000	USD
CY2019	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	-207122000	USD
CY2018	bokf	Net Change In Derivative Margin Accounts NetChangeInDerivativeMarginAccounts	85466000	USD
CY2020	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	-127054000	USD
CY2019	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	33622000	USD
CY2018	us-gaap	Payments For Proceeds From Derivative Instrument Financing Activities PaymentsForProceedsFromDerivativeInstrumentFinancingActivities	-114076000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	75830000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	129483000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	53465000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	144437000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	143496000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	127188000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2796843000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2912813000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1186007000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-78248000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	115397000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1173630000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1258821000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1143424000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2317054000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1180573000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1258821000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	92291000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1143424000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	160288000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	417070000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	243121000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	136181000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	87361000	USD
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	85323000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	10665000	USD
CY2018	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	9880000	USD
CY2020	bokf	Increase In Us Government Guaranteed Loans Eligible For Repurchase IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase	290977000	USD
CY2019	bokf	Increase In Us Government Guaranteed Loans Eligible For Repurchase IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase	91634000	USD
CY2018	bokf	Increase In Us Government Guaranteed Loans Eligible For Repurchase IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase	100238000	USD
CY2020	bokf	Conveyance Of Other Real Estate Owned Guaranteed By Us Govt ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt	11322000	USD
CY2019	bokf	Conveyance Of Other Real Estate Owned Guaranteed By Us Govt ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt	28669000	USD
CY2018	bokf	Conveyance Of Other Real Estate Owned Guaranteed By Us Govt ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt	38216000	USD
CY2020	bokf	Minimum No Of Days After Which Past Due Non Risk Graded Loans Are Charged Off MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff	60 days
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	16177000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	62755000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2020	us-gaap	Reclassifications Reclassifications	Certain prior year amounts have been reclassified to conform to current year presentation.
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Nature of Operations</span></div><div style="text-align:justify"><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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 BOK Financial in the metropolitan areas of Phoenix, Arizona; Northwest Arkansas; Denver, Colorado; Kansas City, Missouri/Kansas; and as Bank of Albuquerque in Albuquerque, New Mexico. BOKF, NA also operates the TransFund electronic funds network, Cavanal Hill Investment Management, and BOK Financial Asset Management, Inc.</span></div>
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Use of Estimates</span></div><div style="text-align:justify"><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Preparation of BOK Financial's Consolidated Financial Statements requires management to make estimates of future economic activities, including loan collectability, loss contingencies, 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.</span></div>
CY2020	bokf	Maturity Of Federal Funds Sold Considered Cash Equivalents MaturityOfFederalFundsSoldConsideredCashEquivalents	one day
CY2020	bokf	Maturity Of Resell Agreement Considered Cash Equivalents Minimum MaturityOfResellAgreementConsideredCashEquivalentsMinimum	one day
CY2020	bokf	Maturity Of Resell Agreements Considered Cash Equivalents Maximum MaturityOfResellAgreementsConsideredCashEquivalentsMaximum	30 days
CY2020	bokf	Loans Number Of Days Past Due For Non Risk Graded Loan To Be Placed On Nonaccruing Status LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus	90 days
CY2020	bokf	Loans Number Of Days After Notification Of Chapter7 Bankruptcy Non Risk Graded Loan Is Placed On Nonaccruing Status LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus	60 days
CY2020	bokf	Max No Of Days After Which Past Due Non Risk Graded Loans Are Charged Off MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff	180 days
CY2020	bokf	Loans Number Of Days After Notification Of Chapter7 Bankruptcy Non Risk Graded Loan Is Charged Off LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff	60 days
CY2019	bokf	Increaseofreportedrightofuseassetsandliabilities Increaseofreportedrightofuseassetsandliabilities	137000000	USD
CY2020Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	4707975000	USD
CY2020Q4	bokf	Trading Securities Net Unrealized Gains Losses TradingSecuritiesNetUnrealizedGainsLosses	-3560000	USD
CY2019Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	1623921000	USD
CY2019Q4	bokf	Trading Securities Net Unrealized Gains Losses TradingSecuritiesNetUnrealizedGainsLosses	2359000	USD
CY2020Q4	bokf	Debt Securities Heldtomaturitygross DebtSecuritiesHeldtomaturitygross	245531000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	272431000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	27046000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	146000	USD
CY2019Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	10100000000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	688000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	244843000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	272431000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	27046000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	146000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	293418000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	314402000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	21285000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	301000	USD
CY2020Q4	bokf	Debt Securities Heldtomaturitygross DebtSecuritiesHeldtomaturitygross	245531000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	272431000	USD
CY2020Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	8
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	2701000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	41000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	2068000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	105000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	4769000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	146000	USD
CY2019Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	17
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1276000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	9747000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	299000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	11023000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	301000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment	66000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	12609850000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	13050665000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	449654000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	8839000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	11131494000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	11269643000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	158435000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	20286000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	12609850000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	13050665000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	384507000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1211718000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	745643000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	9976000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	14996000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	7117000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment	9399000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedLossExcludingOtherThanTemporaryImpairment	9918000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	2524000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1425000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-713000	USD
CY2020Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	11600000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	77
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1143562000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	8197000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	438846000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	642000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1582408000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	8839000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	203
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	2182644000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	10928000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	897351000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	9358000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3079995000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	20286000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	114982000	USD
CY2020Q4	bokf	Fair Value Option Securities Net Unrealized Gain Or Loss FairValueOptionSecuritiesNetUnrealizedGainOrLoss	4463000	USD
CY2019Q4	bokf	Fair Value Option Securities FairValueOptionSecurities	1098577000	USD
CY2019Q4	bokf	Fair Value Option Securities Net Unrealized Gain Or Loss FairValueOptionSecuritiesNetUnrealizedGainOrLoss	14061000	USD
CY2020Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	6682476000	USD
CY2020Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	16090351000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	234693000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	23007520000	USD
CY2020	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	22870000	USD
CY2020Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	11000000000.0	USD
CY2020Q4	bokf	Outstanding Standby Letters Of Credit OutstandingStandbyLettersOfCredit	681000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	236568000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	222460000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	79399000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9011000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	388640000	USD
CY2019Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	25137000	USD
CY2020	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	11784000	USD
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	36921000	USD
CY2020	bokf	Change In Provision Due To Changes In Reasonable And Supportable Forecasts Primarily Due To Covid19 Pandemic ChangeInProvisionDueToChangesInReasonableAndSupportableForecastsPrimarilyDueToCOVID19Pandemic	99100000	USD
CY2020	bokf	Other Changes To Provision OtherChangesToProvision	135200000	USD
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	22772827000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	366199000	USD
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	234693000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	22441000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	23007520000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	388640000	USD
CY2020Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	4855463000	USD
CY2020Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	3161473000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	2651833000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1788880000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1356476000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3054469000	USD
CY2020Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	6108767000	USD
CY2020Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	30159000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	23007520000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	234693000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	167878000	USD
CY2020Q4	bokf	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	66815000	USD
CY2020Q4	bokf	Financing Receivable Nonaccrual Related Allowance FinancingReceivableNonaccrualRelatedAllowance	22441000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	187000000	USD
CY2020Q4	bokf	Troubled Debt Financing Receivable Modification Performing According To Modified Terms TroubledDebtFinancingReceivableModificationPerformingAccordingToModifiedTerms	95000000	USD
CY2020	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	20900000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	132000000	USD
CY2019Q4	bokf	Troubled Debt Financing Receivable Modification Performing According To Modified Terms TroubledDebtFinancingReceivableModificationPerformingAccordingToModifiedTerms	57000000	USD
CY2019	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	18600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	20100000	USD
CY2020	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	83000000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	37000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	22718498000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	23007520000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	88718000	USD
CY2019Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	6134362000	USD
CY2019Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	15435674000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	180951000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	7680000	USD
CY2019	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	17409000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	207457000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	44205000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	50977000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	21570036000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10074000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	210759000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1790000	USD
CY2019	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	-205000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1585000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	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
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	176150000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	180951000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	17414000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	210759000	USD
CY2019Q4	bokf	Internally Risk Graded Recorded Investment InternallyRiskGradedRecordedInvestment	19826731000	USD
CY2019Q4	bokf	Internally Risk Graded Allowance InternallyRiskGradedAllowance	179129000	USD
CY2019Q4	bokf	Non Graded Recorded Investment NonGradedRecordedInvestment	1924256000	USD
CY2019Q4	bokf	Non Graded Allowance NonGradedAllowance	14435000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	210759000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	467714000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	372645000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	323505000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	49140000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	17414000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	354262000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	8931000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	21392306000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	180951000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	21750987000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	843041000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	779050000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	291733000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	243531000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	551308000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	535519000	USD
CY2020	us-gaap	Depreciation Depreciation	54300000	USD
CY2019	us-gaap	Depreciation Depreciation	51600000	USD
CY2018	us-gaap	Depreciation Depreciation	51200000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	166000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	180000000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.030
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	25000000.0	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	24200000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	25600000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	23300000	USD
CY2020	us-gaap	Lease Cost LeaseCost	42000000.0	USD
CY2019	us-gaap	Lease Cost LeaseCost	43000000.0	USD
CY2018	us-gaap	Lease Cost LeaseCost	28500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	26300000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	21200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	19600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	18900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	116000000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	13400000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	12600000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	113436000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	125271000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	18492000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	16213000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	14336000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12557000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	11442000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	40396000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	113436000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1049263000	USD
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-1172000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1048091000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1048091000	USD
CY2020Q4	bokf	Residential Mortgage Loans Held For Sale Unpaid Principal Balance Gross ResidentialMortgageLoansHeldForSaleUnpaidPrincipalBalanceGross	227161000	USD
CY2020Q4	bokf	Fair Valueof Residential Mortgage Loans Heldfor Sale FairValueofResidentialMortgageLoansHeldforSale	236444000	USD
CY2019Q4	bokf	Residential Mortgage Loans Held For Sale Unpaid Principal Balance Gross ResidentialMortgageLoansHeldForSaleUnpaidPrincipalBalanceGross	175117000	USD
CY2019Q4	bokf	Fair Valueof Residential Mortgage Loans Heldfor Sale FairValueofResidentialMortgageLoansHeldforSale	177703000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	252316000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	182271000	USD
CY2019Q4	bokf	Residential Mortgage Loans Held For Sale Nonperforming ResidentialMortgageLoansHeldForSaleNonperforming	0	USD
CY2020Q4	bokf	Residential Mortgage Loans Held For Sale Nonperforming ResidentialMortgageLoansHeldForSaleNonperforming	0	USD
CY2019	bokf	Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale	90
CY2020	bokf	Number Of Days For Past Due Residential Mortgage Loans Heldfor Sale NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale	90
CY2019	bokf	Credit Losses Recognized On Residential Mortgage Loans Held For Sale CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale	0	USD
CY2020	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
CY2020	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	107847000	USD
CY2019	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	39730000	USD
CY2018	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	36379000	USD
CY2020	bokf	Netchangeinunrealizedgainonmortgageloansheldforsale Netchangeinunrealizedgainonmortgageloansheldforsale	6697000	USD
CY2019	bokf	Netchangeinunrealizedgainonmortgageloansheldforsale Netchangeinunrealizedgainonmortgageloansheldforsale	672000	USD
CY2018	bokf	Netchangeinunrealizedgainonmortgageloansheldforsale Netchangeinunrealizedgainonmortgageloansheldforsale	-674000	USD
CY2020	bokf	Changeinfairvalueofmortgageloancommitments Changeinfairvalueofmortgageloancommitments	15202000	USD
CY2019	bokf	Changeinfairvalueofmortgageloancommitments Changeinfairvalueofmortgageloancommitments	-145000	USD
CY2018	bokf	Changeinfairvalueofmortgageloancommitments Changeinfairvalueofmortgageloancommitments	-1145000	USD
CY2020	bokf	Changeinthefairvalueofforwardsalescommitments Changeinthefairvalueofforwardsalescommitments	-3898000	USD
CY2019	bokf	Changeinthefairvalueofforwardsalescommitments Changeinthefairvalueofforwardsalescommitments	2463000	USD
CY2018	bokf	Changeinthefairvalueofforwardsalescommitments Changeinthefairvalueofforwardsalescommitments	-2870000	USD
CY2020	bokf	Mortgage Production Revenue MortgageProductionRevenue	125848000	USD
CY2019	bokf	Mortgage Production Revenue MortgageProductionRevenue	42720000	USD
CY2018	bokf	Mortgage Production Revenue MortgageProductionRevenue	31690000	USD
CY2020	bokf	Mortgage Servicing Fees MortgageServicingFees	56512000	USD
CY2019	bokf	Mortgage Servicing Fees MortgageServicingFees	64821000	USD
CY2018	bokf	Mortgage Servicing Fees MortgageServicingFees	66097000	USD
CY2020	bokf	Mortgage Banking Revenue MortgageBankingRevenue	182360000	USD
CY2019	bokf	Mortgage Banking Revenue MortgageBankingRevenue	107541000	USD
CY2018	bokf	Mortgage Banking Revenue MortgageBankingRevenue	97787000	USD
CY2020Q4	bokf	Residential Mortgage Loans Serviced Number Of Loans ResidentialMortgageLoansServicedNumberOfLoans	106201
CY2019Q4	bokf	Residential Mortgage Loans Serviced Number Of Loans ResidentialMortgageLoansServicedNumberOfLoans	126828
CY2018Q4	bokf	Residential Mortgage Loans Serviced Number Of Loans ResidentialMortgageLoansServicedNumberOfLoans	132463
CY2020Q4	bokf	Residential Mortgage Loans Serviced Outstanding Principal ResidentialMortgageLoansServicedOutstandingPrincipal	16228449000	USD
CY2019Q4	bokf	Residential Mortgage Loans Serviced Outstanding Principal ResidentialMortgageLoansServicedOutstandingPrincipal	20727106000	USD
CY2018Q4	bokf	Residential Mortgage Loans Serviced Outstanding Principal ResidentialMortgageLoansServicedOutstandingPrincipal	21658335000	USD
CY2020Q4	bokf	Weighted Average Interest Rateof Loans Servicedfor Others WeightedAverageInterestRateofLoansServicedforOthers	0.0384
CY2019Q4	bokf	Weighted Average Interest Rateof Loans Servicedfor Others WeightedAverageInterestRateofLoansServicedforOthers	0.0398
CY2018Q4	bokf	Weighted Average Interest Rateof Loans Servicedfor Others WeightedAverageInterestRateofLoansServicedforOthers	0.0399
CY2020	bokf	Residential Mortgage Loans Serviced Weighted Average Remaining Term ResidentialMortgageLoansServicedWeightedAverageRemainingTerm	280
CY2019	bokf	Residential Mortgage Loans Serviced Weighted Average Remaining Term ResidentialMortgageLoansServicedWeightedAverageRemainingTerm	289
CY2018	bokf	Residential Mortgage Loans Serviced Weighted Average Remaining Term ResidentialMortgageLoansServicedWeightedAverageRemainingTerm	293
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
CY2019	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	35128000	USD
CY2019	bokf	Change In Fair Value Due To Loan Runoff ChangeInFairValueDueToLoanRunoff	-38979000	USD
CY2019	us-gaap	Asset At Fair Value Changes In Fair Value Resulting From Changes In Assumptions AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions	-53517000	USD
CY2019Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	201886000	USD
CY2020	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	31209000	USD
CY2020	us-gaap	Servicing Asset At Fair Value Disposals ServicingAssetAtFairValueDisposals	10801000	USD
CY2020	bokf	Change In Fair Value Due To Loan Runoff ChangeInFairValueDueToLoanRunoff	-41598000	USD
CY2020	us-gaap	Asset At Fair Value Changes In Fair Value Resulting From Changes In Assumptions AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions	-79524000	USD
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	101172000	USD
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.0914
CY2019	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.0981
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum	0.0941
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum	0.2187
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum	0.0828
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum	0.1605
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum	69	USD
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum	94	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum	68	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum	94	USD
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum	150	USD
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum	500	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum	150	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Delinquent Loan Svc Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum	500	USD
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum	1000	USD
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum	4000	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Minimum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum	1000	USD
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Foreclosure Loan Service Cost Maximum ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum	4000	USD
CY2020Q4	bokf	Primarysecondarymortgageratespread Primarysecondarymortgageratespread	105
CY2019Q4	bokf	Primarysecondarymortgageratespread Primarysecondarymortgageratespread	104
CY2020	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Escrow Earnings Rate ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate	0.0043
CY2019	bokf	Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Escrow Earnings Rate ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate	0.0173
CY2020	bokf	Servicing Assetsand Servicing Liabilitiesat Fair Value Assumptions Usedto Estimate Fair Value Delinquency Rate ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueDelinquencyRate	0.0354
CY2019	bokf	Servicing Assetsand Servicing Liabilitiesat Fair Value Assumptions Usedto Estimate Fair Value Delinquency Rate ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueDelinquencyRate	0.0273
CY2020	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	60424000	USD
CY2019	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	132854000	USD
CY2018	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	65859000	USD
CY2020	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	385000	USD
CY2019	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	677000	USD
CY2018	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	439000	USD
CY2020	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	6741000	USD
CY2019	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	8299000	USD
CY2018	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	5751000	USD
CY2020	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	18270000	USD
CY2019	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	29288000	USD
CY2018	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	19739000	USD
CY2020	bokf	Interest Expense On Other Time Deposits InterestExpenseOnOtherTimeDeposits	4176000	USD
CY2019	bokf	Interest Expense On Other Time Deposits InterestExpenseOnOtherTimeDeposits	4420000	USD
CY2018	bokf	Interest Expense On Other Time Deposits InterestExpenseOnOtherTimeDeposits	3729000	USD
CY2020	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	29187000	USD
CY2019	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	42007000	USD
CY2018	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	29219000	USD
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	89996000	USD
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	175538000	USD
CY2018	us-gaap	Interest Expense Deposits InterestExpenseDeposits	95517000	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	815000000	USD
CY2019Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	845000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1500000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	172000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	90000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	54000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	41000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	100000000	USD
CY2020Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	3100000	USD
CY2019Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	8700000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	3821361000	USD
CY2020	bokf	Debt Average Balance DebtAverageBalance	8570959000	USD
CY2020	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0082
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	8621328000	USD
CY2019	bokf	Debt Average Balance DebtAverageBalance	10261592000	USD
CY2019	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0237
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
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1884974000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1639735000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	9625000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	625000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	10555000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	275847000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	3821361000	USD
CY2020	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Additional information relating to securities sold under agreements to repurchase and related liabilities at December 31, 2020 and 2019 is as follows (dollars in thousands):</span></div><div style="margin-bottom:5pt;margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:99.561%"><tr><td style="width:1.0%"/><td style="width:52.350%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.534%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:9.913%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.534%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:9.619%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.534%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:10.647%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.534%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:9.035%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="21" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">December 31, 2020</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Amortized</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Fair</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Repurchase</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Security Sold/Maturity</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Cost</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Value</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Liability</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.85pt;font-weight:700;line-height:100%;position:relative;top:-3.15pt;vertical-align:baseline">1</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Rate</span></td></tr><tr style="height:14pt"><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">U.S. government agency mortgage-backed securities:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="padding-left:6.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Overnight</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.85pt;font-weight:400;line-height:100%;position:relative;top:-3.15pt;vertical-align:baseline">1</span></div></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">893,069</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">910,885</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">893,021</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">0.09</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">%</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Long-term</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">—</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">—</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">—</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">—</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">%</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Total Agency Securities</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">893,069</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">910,885</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">893,021</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">0.09</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">%</span></td></tr><tr style="height:14pt"><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="21" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">December 31, 2019</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Amortized</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Fair</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Repurchase</span></td><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Security Sold/Maturity</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Cost</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Value</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Liability</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.85pt;font-weight:700;line-height:100%;position:relative;top:-3.15pt;vertical-align:baseline">1</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Rate</span></td></tr><tr style="height:14pt"><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:2pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">U.S. government agency mortgage-backed securities:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="padding-left:6.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Overnight</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.85pt;font-weight:400;line-height:100%;position:relative;top:-3.15pt;vertical-align:baseline">1</span></div></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">431,939 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">435,898 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">427,822 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">0.50 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">%</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Long-term</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">%</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Total Agency Securities</span></td><td colspan="3" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">431,939 </span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">435,898 </span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">427,822 </span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">0.50 </span></td><td style="background-color:#ffffff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:100%">%</span></td></tr></table></div><div style="padding-left:9pt;text-indent:-9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.2pt;font-weight:400;line-height:120%;position:relative;top:-2.8pt;vertical-align:baseline">1</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">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>
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	101265000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	50611000	USD
CY2020Q4	bokf	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	44794000	USD
CY2019Q4	bokf	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	46084000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	29504000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	25976000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	14584000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	9080000	USD
CY2020Q4	bokf	Deferred Tax Assets Purchased Loan Discount DeferredTaxAssetsPurchasedLoanDiscount	11537000	USD
CY2019Q4	bokf	Deferred Tax Assets Purchased Loan Discount DeferredTaxAssetsPurchasedLoanDiscount	18042000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6525000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	7392000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	3834000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	1545000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	29963000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	26384000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	242006000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	185114000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	105769000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	33140000	USD
CY2020Q4	bokf	Deferred Tax Liabilities Rightof Use Asset DeferredTaxLiabilitiesRightofUseAsset	38635000	USD
CY2019Q4	bokf	Deferred Tax Liabilities Rightof Use Asset DeferredTaxLiabilitiesRightofUseAsset	42180000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	24182000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	48435000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	18138000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	23181000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13754000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	18909000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	11828000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	10720000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	39210000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	34826000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	251516000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	211391000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9510000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	26277000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	173888000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	110887000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	103748000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	29889000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15088000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15253000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	203777000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	125975000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	119001000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-65989000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3416000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-190000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-8995000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	792000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	250000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-74984000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4208000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	60000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	128793000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	130183000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	119061000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	118412000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	132482000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	118752000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	7035000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	12227000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	8311000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14251000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12715000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12430000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	6994000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	5127000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	4559000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	10159000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2340000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	749000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	128793000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	130183000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	119061000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.012
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.019
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.015
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.025
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.022
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.012
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.008
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.008
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.017
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.228
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.206
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.211
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20465000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18869000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18110000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6384000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5649000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2649000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3947000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4053000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1890000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22902000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20465000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18869000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	17200000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	5600000	USD
CY2020	bokf	Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination Federal UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationFederal	3
CY2020	bokf	Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination State Minimum UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationStateMinimum	3
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	5900000	USD
CY2020	bokf	Unrecognized Tax Benefits Numberof Reporting Periods Openfor Examination State Maximum UnrecognizedTaxBenefitsNumberofReportingPeriodsOpenforExaminationStateMaximum	6
CY2020Q4	bokf	Mutual Funds Managed Net Asset Value Of Units In Mutual Funds MutualFundsManagedNetAssetValueOfUnitsInMutualFunds	1.00
CY2020Q4	bokf	Mutual Funds Managed Net Asset Value Of Units In Mutual Funds MutualFundsManagedNetAssetValueOfUnitsInMutualFunds	1.00
CY2019	bokf	Assets Purchased From Mutual Funds Managed AssetsPurchasedFromMutualFundsManaged	0	USD
CY2020	bokf	Minimum Average Cash Balance Required To Be Maintained At Federal Reserve By Subsidiary Bank MinimumAverageCashBalanceRequiredToBeMaintainedAtFederalReserveBySubsidiaryBank	727000000	USD
CY2019	bokf	Minimum Average Cash Balance Required To Be Maintained At Federal Reserve By Subsidiary Bank MinimumAverageCashBalanceRequiredToBeMaintainedAtFederalReserveBySubsidiaryBank	618000000	USD
CY2020Q4	bokf	Common Equity Tier One Capitalto Risk Weighted Assets Minimum Requirement CommonEquityTierOneCapitaltoRiskWeightedAssetsMinimumRequirement	0.0450
CY2019Q4	bokf	Common Equity Tier One Capitalto Risk Weighted Assets Minimum Requirement CommonEquityTierOneCapitaltoRiskWeightedAssetsMinimumRequirement	0.0450
CY2019Q4	bokf	Capital Conservation Buffer Common Equity Tier Oneto Risk Weighted Assets CapitalConservationBufferCommonEquityTierOnetoRiskWeightedAssets	0.0250
CY2020Q4	bokf	Capital Conservation Buffer Common Equity Tier Oneto Risk Weighted Assets CapitalConservationBufferCommonEquityTierOnetoRiskWeightedAssets	0.0250
CY2020Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Commonequity Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferCommonequityTierOnetoRiskWeightedAssets	0.0700
CY2019Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Commonequity Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferCommonequityTierOnetoRiskWeightedAssets	0.0700
CY2020Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	3881912000	USD
CY2020Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1195
CY2019Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	3608821000	USD
CY2019Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1139
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600
CY2020Q4	bokf	Capital Conservation Buffer Tier1 Capitalto Risk Weighted Assets CapitalConservationBufferTier1CapitaltoRiskWeightedAssets	0.0250
CY2019Q4	bokf	Capital Conservation Buffer Tier1 Capitalto Risk Weighted Assets CapitalConservationBufferTier1CapitaltoRiskWeightedAssets	0.0250
CY2020Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferTierOnetoRiskWeightedAssets	0.0850
CY2019Q4	bokf	Minimum Capital Requirement Including Capital Conservation Buffer Tier Oneto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferTierOnetoRiskWeightedAssets	0.0850
CY2020Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	3881912000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1195
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	3608821000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1139
CY2020Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800
CY2019Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800
CY2019Q4	bokf	Capital Conservation Buffer Total Capitalto Risk Weighted Assets CapitalConservationBufferTotalCapitaltoRiskWeightedAssets	0.0250
CY2020Q4	bokf	Capital Conservation Buffer Total Capitalto Risk Weighted Assets CapitalConservationBufferTotalCapitaltoRiskWeightedAssets	0.0250
CY2019Q4	bokf	Minimum Capital Requirement Including Capital Conservation Bufferfor Total Capitalto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferforTotalCapitaltoRiskWeightedAssets	0.1050
CY2020Q4	bokf	Minimum Capital Requirement Including Capital Conservation Bufferfor Total Capitalto Risk Weighted Assets MinimumCapitalRequirementIncludingCapitalConservationBufferforTotalCapitaltoRiskWeightedAssets	0.1050
CY2020Q4	us-gaap	Capital Capital	4489110000	USD
CY2020Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1382
CY2019Q4	us-gaap	Capital Capital	4097087000	USD
CY2019Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1294
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2020Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2019Q4	bokf	Minimum Capital Requirements Including Capital Conservation Buffer Tier One Capitalto Average Assets MinimumCapitalRequirementsIncludingCapitalConservationBufferTierOneCapitaltoAverageAssets	0.0400
CY2020Q4	bokf	Minimum Capital Requirements Including Capital Conservation Buffer Tier One Capitalto Average Assets MinimumCapitalRequirementsIncludingCapitalConservationBufferTierOneCapitaltoAverageAssets	0.0400
CY2020Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	3881912000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0828
CY2019Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	3608820000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0840
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-36174000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-48010000	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
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	241047000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	5597000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	235450000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	57942000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	177508000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	104923000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	313796000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	9910000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	303886000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	72941000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	230945000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	335868000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	435030000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	500758000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	445646000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2612000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	3227000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	3737000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	432418000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	497531000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	441909000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-1000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	432418000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	497531000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	441910000	USD
CY2020	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	70259553	shares
CY2019	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	71250081	shares
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	67190257	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	418576	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	462381	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	561617	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	69840977	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	70787700	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66628640	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3195	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	14912	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	33633	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69844172	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70802612	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	66662273	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.19
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.03
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.63
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.19
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.03
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.63
CY2020	bokf	Nir Expense From External Sources NirExpenseFromExternalSources	1108444000	USD
CY2020	bokf	Ni Rexpensefrominternalsources NIRexpensefrominternalsources	0	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1108444000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	222592000	USD
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	885852000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	843949000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	1165937000	USD
CY2020	bokf	Netdirectcontribution Netdirectcontribution	563864000	USD
CY2020	bokf	Gain Losson Financial Instruments Net GainLossonFinancialInstrumentsNet	0	USD
CY2020	bokf	Segment Reporting Changein Fair Valueof Mortgage Servicing Rights SegmentReportingChangeinFairValueofMortgageServicingRights	0	USD
CY2020	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
CY2020	bokf	Corporate Expense Allocations CorporateExpenseAllocations	0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	563864000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	128793000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	435071000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	41000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	435030000	USD
CY2020	bokf	Average Assets For Reporting Period AverageAssetsForReportingPeriod	48704390000	USD
CY2019	bokf	Nir Expense From External Sources NirExpenseFromExternalSources	1112879000	USD
CY2019	bokf	Ni Rexpensefrominternalsources NIRexpensefrominternalsources	0	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1112879000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1068879000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	694370000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	1132381000	USD
CY2019	bokf	Netdirectcontribution Netdirectcontribution	630868000	USD
CY2019	bokf	Gain Losson Financial Instruments Net GainLossonFinancialInstrumentsNet	0	USD
CY2019	bokf	Segment Reporting Changein Fair Valueof Mortgage Servicing Rights SegmentReportingChangeinFairValueofMortgageServicingRights	0	USD
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
CY2019	bokf	Corporate Expense Allocations CorporateExpenseAllocations	0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	630868000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	130183000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	500685000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-73000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	500758000	USD
CY2019	bokf	Average Assets For Reporting Period AverageAssetsForReportingPeriod	42094347000	USD
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 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	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	778000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	445646000	USD
CY2018	bokf	Average Assets For Reporting Period AverageAssetsForReportingPeriod	34937530000	USD

Files In Submission

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$BOKF
BOK FINANCIAL CORP Stock $bokf

2020 Form 10-K Financial Statement

#000087535721000013 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

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$BOKF BOK FINANCIAL CORP Stock $bokf

2020 Form 10-K Financial Statement

#000087535721000013 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BOKF
BOK FINANCIAL CORP Stock $bokf