$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal

$wal Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000121254518000091 Filed on February 26, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$187.4M	$184.8M	$174.1M
YoY Change	23.84%	26.34%	49.28%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.200M	$3.200M	$3.500M
YoY Change	28.0%	52.38%	94.44%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$12.14M	$12.20M	$10.40M
YoY Change	52.0%	38.26%	31.68%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$96.16M	$96.22M	$87.94M
YoY Change	23.49%	31.82%	65.76%
Income Tax	$26.36M	$29.17M	$26.33M
% Of Pretax Income	27.42%	30.32%	29.94%
Net Earnings	$69.80M	$67.05M	$61.61M
YoY Change	19.26%	20.04%	56.08%
Net Earnings / Revenue	37.24%	36.29%	35.39%
Basic Earnings Per Share	$0.67	$0.65	$0.60
Diluted Earnings Per Share	$0.67	$0.64	$0.60
COMMON SHARES
Basic Shares Outstanding	105.1M shares	103.8M shares	102.7M shares
Diluted Shares Outstanding		104.6M shares	103.5M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$284.5M	$356.1M	$696.2M
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	$119.8M	$121.3M	$120.5M
YoY Change	1.1%	-0.38%	3.86%
Goodwill	$290.0M	$290.0M	$290.0M
YoY Change	0.11%	0.21%	2.52%
Intangibles	$12.93M	$13.63M	$14.32M
YoY Change	-17.75%	-17.02%	-16.36%
Long-Term Investments
YoY Change
Other Assets	$95.00M	$73.00M	$65.00M
YoY Change	10.47%	-7.59%	-20.73%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$17.20B	$17.04B	$16.73B
YoY Change	20.5%	22.12%	24.19%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$80.00M	$0.00	$0.00
YoY Change	-46.67%	-100.0%	-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$42.00M	$44.00M	$38.00M
YoY Change	10.53%	-16.98%	-75.95%
LONG-TERM LIABILITIES
Long-Term Debt	$368.0M	$383.0M	$382.0M
YoY Change
Other Long-Term Liabilities	$270.0M	$315.0M	$311.0M
YoY Change	6.3%	56.72%	81.87%
Total Long-Term Liabilities	$638.0M	$698.0M	$693.0M
YoY Change
TOTAL LIABILITIES
Total Short-Term Liabilities	$42.00M	$44.00M	$38.00M
Total Long-Term Liabilities	$638.0M	$698.0M	$693.0M
Total Liabilities	$15.31B	$15.19B	$14.93B
YoY Change	20.7%	22.74%	24.9%
SHAREHOLDERS EQUITY
Retained Earnings	$522.4M	$452.6M	$385.6M
YoY Change	98.92%	106.78%	141.08%
Common Stock	$10.00K	$10.00K	$10.00K
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$26.36M	$26.21M	$25.92M
YoY Change	56.18%
Treasury Stock Shares		1.297M shares	1.288M shares
Shareholders Equity	$1.892B	$1.857B	$1.796B
YoY Change
Total Liabilities & Shareholders Equity	$17.20B	$17.04B	$16.73B
YoY Change	20.5%	22.12%	24.19%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$69.80M	$67.05M	$61.61M
YoY Change	19.26%	20.04%	56.08%
Depreciation, Depletion And Amortization	$3.200M	$3.200M	$3.500M
YoY Change	28.0%	52.38%	94.44%
Cash From Operating Activities	$66.10M	$99.40M	$43.80M
YoY Change	-12.8%	79.1%	165.45%
INVESTING ACTIVITIES
Capital Expenditures	-$1.300M	-$2.700M	-$3.500M
YoY Change	-230.0%	-66.25%	105.88%
Acquisitions
YoY Change
Other Investing Activities	-$320.8M	-$684.2M	-$1.722B
YoY Change	-17.81%	-21.69%	-780.21%
Cash From Investing Activities	-$321.9M	-$687.0M	-$1.726B
YoY Change	-17.29%	-22.08%	-786.2%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	184.2M	247.4M	1.347B
YoY Change	-13.4%	-37.08%	-67465.0%
NET CHANGE
Cash From Operating Activities	66.10M	99.40M	43.80M
Cash From Investing Activities	-321.9M	-687.0M	-1.726B
Cash From Financing Activities	184.2M	247.4M	1.347B
Net Change In Cash	-71.60M	-340.2M	-334.7M
YoY Change	-28.9%	-21.43%	-225.83%
FREE CASH FLOW
Cash From Operating Activities	$66.10M	$99.40M	$43.80M
Capital Expenditures	-$1.300M	-$2.700M	-$3.500M
Free Cash Flow	$67.40M	$102.1M	$47.30M
YoY Change	-9.89%	60.79%	159.89%

Facts In Submission

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CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001212545
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CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	4790000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	WESTERN ALLIANCE BANCORPORATION
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	dei	Trading Symbol TradingSymbol	WAL
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CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	124805000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	95194000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	5780000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9024000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	34710000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	13679000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10239000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1428000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	24171000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	12302000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	8335000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	50860000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	37851000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	9149000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	4117000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	3212000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	-6594000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	4949000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2809000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1516000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	977000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	449000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	-68799000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	8394000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	8891000	USD
CY2016	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	88000	USD
CY2017	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	470000	USD
CY2016	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	100000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	114000	USD
CY2016	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	101000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	103000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0575
CY2017Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0575
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2017Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0300
CY2015Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	7444000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	8394000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	8891000	USD
CY2016	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	67000	USD
CY2017	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	67000	USD
CY2016	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	425000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	454000	USD
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1040000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1023000	USD
CY2016	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	614000	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	580000	USD
CY2015	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2200000	USD
CY2016	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2700000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3100000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Amount DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	18000	USD
CY2016Q4	us-gaap	Deposits Deposits	14549863000	USD
CY2016Q4	us-gaap	Deposits Deposits	14549863000	USD
CY2017Q4	us-gaap	Deposits Deposits	16972500000	USD
CY2017Q4	us-gaap	Deposits Deposits	16972532000	USD
CY2016Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	6120877000	USD
CY2017Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	6330977000	USD
CY2016Q4	us-gaap	Deposits Wholesale DepositsWholesale	136200000	USD
CY2017Q4	us-gaap	Deposits Wholesale DepositsWholesale	67300000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8466000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	12494000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	13393000	USD
CY2015	us-gaap	Depreciation Nonproduction DepreciationNonproduction	7700000	USD
CY2016	us-gaap	Depreciation Nonproduction DepreciationNonproduction	9200000	USD
CY2017	us-gaap	Depreciation Nonproduction DepreciationNonproduction	9900000	USD
CY2017Q4	us-gaap	Derivative Amount Of Hedged Item DerivativeAmountOfHedgedItem	-308608000	USD
CY2015Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	64785000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	63880000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	52685000	USD
CY2015	us-gaap	Derivative Net Hedge Ineffectiveness Gain Loss DerivativeNetHedgeIneffectivenessGainLoss	79000	USD
CY2016	us-gaap	Derivative Net Hedge Ineffectiveness Gain Loss DerivativeNetHedgeIneffectivenessGainLoss	63000	USD
CY2015	us-gaap	Dividend Income Securities Operating Taxable DividendIncomeSecuritiesOperatingTaxable	10317000	USD
CY2016	us-gaap	Dividend Income Securities Operating Taxable DividendIncomeSecuritiesOperatingTaxable	9002000	USD
CY2017	us-gaap	Dividend Income Securities Operating Taxable DividendIncomeSecuritiesOperatingTaxable	7740000	USD
CY2015	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	-750000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.05
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.52
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.12
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.03
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.50
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.85
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.10
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2487
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2807
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2796
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	20300000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	5874000	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	5874000	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	4075000	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	6608000	USD
CY2015	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-2129000	USD
CY2016	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-2805000	USD
CY2017	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-3212000	USD
CY2016Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	4622607000	USD
CY2017Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	6166876000	USD
CY2017Q4	us-gaap	Fair Value Hedge Assets At Fair Value FairValueHedgeAssetsAtFairValue	9959000	USD
CY2015	us-gaap	Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-6523000	USD
CY2016	us-gaap	Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-3500000	USD
CY2017	us-gaap	Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-5824000	USD
CY2016Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	50410000	USD
CY2017Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Subordinated Debt Obligations FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations	56234000	USD
CY2015	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome	-4276000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome	-2077000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome	-3604000	USD
CY2016	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0055
CY2017	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0141
CY2016Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	80000000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	390000000	USD
CY2015	us-gaap	Fees And Commissions FeesAndCommissions	14782000	USD
CY2016	us-gaap	Fees And Commissions FeesAndCommissions	18824000	USD
CY2017	us-gaap	Fees And Commissions FeesAndCommissions	20346000	USD
CY2015	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	4718000	USD
CY2016	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	5226000	USD
CY2017	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	6313000	USD
CY2014Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	110216000	USD
CY2015Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	119068000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	124704000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140050000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	118642000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	132813000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	4239000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5606000	USD
CY2015	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	-12149000	USD
CY2016	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	-11185000	USD
CY2017	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	-9100000	USD
CY2015	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6497000	USD
CY2016	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	13549000	USD
CY2017	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	11004000	USD
CY2016Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	12924164000	USD
CY2017Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	14879626000	USD
CY2016Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	99209000	USD
CY2017Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	98554000	USD
CY2015	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3
CY2016	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2
CY2017	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	15
CY2015	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	527000	USD
CY2016	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2405000	USD
CY2017	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	6628000	USD
CY2015	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	530000	USD
CY2016	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2405000	USD
CY2017	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6628000	USD
CY2015	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	4
CY2016	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	3
CY2017	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	6
CY2015	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1184000	USD
CY2016	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	5789000	USD
CY2017	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1697000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1067000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	43000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	13166460000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	15061371000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	40272000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	43925000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	23067000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	32564000	USD
CY2016	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	39300000	USD
CY2017	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	170900000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	3071000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1594000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1364000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1433000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1494000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1547000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10503000	USD
CY2014Q4	us-gaap	Foreclosed Assets ForeclosedAssets	57150000	USD
CY2015Q4	us-gaap	Foreclosed Assets ForeclosedAssets	43942000	USD
CY2016Q4	us-gaap	Foreclosed Assets ForeclosedAssets	47815000	USD
CY2017Q4	us-gaap	Foreclosed Assets ForeclosedAssets	28540000	USD
CY2015	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1535000	USD
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	3419000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	3536000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-376000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-21000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-28000	USD
CY2015	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	615000	USD
CY2016	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	1059000	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	2343000	USD
CY2015	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	615000	USD
CY2016	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1059000	USD
CY2017	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	2343000	USD
CY2015	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	517000	USD
CY2016	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2492000	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	945000	USD
CY2015	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	1144000	USD
CY2016	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	2115000	USD
CY2017	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	3204000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-81000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2015	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2628000	USD
CY2016	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-372000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	228000	USD
CY2015	us-gaap	General Insurance Expense GeneralInsuranceExpense	11003000	USD
CY2016	us-gaap	General Insurance Expense GeneralInsuranceExpense	12898000	USD
CY2017	us-gaap	General Insurance Expense GeneralInsuranceExpense	14042000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	289967000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	289900000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	289895000	USD
CY2016Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	92079000	USD
CY2017Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	255050000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	433000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	4514000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	546000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	3250000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	546000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	3250000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	30364000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	107921000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	546000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3250000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	30364000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	107921000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	14860000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	14979000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	11377000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	11300000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	230077000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	228771000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	91966000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	256314000	USD
CY2015	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	150151000	USD
CY2016	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	109461000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	104866000	USD
CY2015	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	4794000	USD
CY2016	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	4167000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	4046000	USD
CY2015	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	1634000	USD
CY2016	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	1254000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	1614000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	99209000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	98554000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	4239000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5606000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	88300000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	79239000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	164721000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	156789000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	10909000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	19315000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	11162000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	20795000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	61332000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	61614000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	67052000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	69800000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	73342000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	79960000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	82844000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	89346000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	258538000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	80851000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	87941000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	96223000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	96164000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	361179000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97831000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	111924000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	117743000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	124319000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	451817000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64294000	USD
CY2016Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19519000	USD
CY2016Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26327000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29171000	USD
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26364000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	101381000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	101381000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24489000	USD
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31964000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34899000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34973000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	126325000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2290000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	10411000	USD
CY2017Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	217836000	USD
CY2017Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	228459000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	90489000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	126413000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	158136000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-1365000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-1317000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Life Insurance IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	-1351000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5783000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8046000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9765000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	20226000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-22425000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	26403000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	54590000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	61281000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	99430000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-89400000	USD
CY2015	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1357855000	USD
CY2016	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	2519239000	USD
CY2017	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	2422669000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	23966000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	19047000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	105293000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	14231000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2334000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	18338000	USD
CY2016Q4	us-gaap	Indefinite Lived Trade Names IndefiniteLivedTradeNames	350000	USD
CY2017Q4	us-gaap	Indefinite Lived Trade Names IndefiniteLivedTradeNames	350000	USD
CY2015	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	15830000	USD
CY2016	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	19657000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	19225000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	12927000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10853000	USD
CY2016Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	302900000	USD
CY2017Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	300700000	USD
CY2015	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	525144000	USD
CY2016Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	154256000	USD
CY2016Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	174089000	USD
CY2016Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	184750000	USD
CY2016Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	187411000	USD
CY2016	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	700506000	USD
CY2017Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	192265000	USD
CY2017Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	206953000	USD
CY2017	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	845513000	USD
CY2015	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	54000	USD
CY2016	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	41000	USD
CY2017	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	9000	USD
CY2015	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	476417000	USD
CY2016	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	636596000	USD
CY2017	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	747510000	USD
CY2016Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	8916937000	USD
CY2017Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9538570000	USD
CY2016Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	116425000	USD
CY2017Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	235577000	USD
CY2015	us-gaap	Interest Expense InterestExpense	32568000	USD
CY2016Q1	us-gaap	Interest Expense InterestExpense	8545000	USD
CY2016Q2	us-gaap	Interest Expense InterestExpense	10403000	USD
CY2016Q3	us-gaap	Interest Expense InterestExpense	12203000	USD
CY2016Q4	us-gaap	Interest Expense InterestExpense	12142000	USD
CY2016	us-gaap	Interest Expense InterestExpense	43293000	USD
CY2017Q1	us-gaap	Interest Expense InterestExpense	12956000	USD
CY2017Q2	us-gaap	Interest Expense InterestExpense	14210000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	16253000	USD
CY2017Q4	us-gaap	Interest Expense InterestExpense	17430000	USD
CY2017	us-gaap	Interest Expense InterestExpense	60849000	USD
CY2015	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	5678000	USD
CY2016	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	508000	USD
CY2017	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	561000	USD
CY2015	us-gaap	Interest Expense Debt InterestExpenseDebt	-2151000	USD
CY2016	us-gaap	Interest Expense Debt InterestExpenseDebt	-2828000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	-3221000	USD
CY2015	us-gaap	Interest Expense Deposits InterestExpenseDeposits	21795000	USD
CY2016	us-gaap	Interest Expense Deposits InterestExpenseDeposits	29722000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	41965000	USD
CY2015	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	200000	USD
CY2016	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	200000	USD
CY2017	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	200000	USD
CY2015	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	88000	USD
CY2016	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	65000	USD
CY2017	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	50000	USD
CY2015	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	5007000	USD
CY2016	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	12998000	USD
CY2017	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	18273000	USD
CY2015	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	489376000	USD
CY2016Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	143211000	USD
CY2016Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	161186000	USD
CY2016Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	170547000	USD
CY2016Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	174269000	USD
CY2016	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	649213000	USD
CY2017Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	175059000	USD
CY2017Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	189743000	USD
CY2017Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	196583000	USD
CY2017Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	206029000	USD
CY2017	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	767414000	USD
CY2015	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	492576000	USD
CY2016Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	145711000	USD
CY2016Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	163686000	USD
CY2016Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	172547000	USD
CY2016Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	175269000	USD
CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	657213000	USD
CY2017Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	179309000	USD
CY2017Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	192743000	USD
CY2017Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	201583000	USD
CY2017Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	211029000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	784664000	USD
CY2015	us-gaap	Interest Income Related Party InterestIncomeRelatedParty	2700000	USD
CY2016	us-gaap	Interest Income Related Party InterestIncomeRelatedParty	600000	USD
CY2017	us-gaap	Interest Income Related Party InterestIncomeRelatedParty	500000	USD
CY2015	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	37888000	USD
CY2016	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	52570000	USD
CY2017	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	83354000	USD
CY2015	us-gaap	Interest Paid InterestPaid	28831000	USD
CY2016	us-gaap	Interest Paid InterestPaid	41565000	USD
CY2017	us-gaap	Interest Paid InterestPaid	59838000	USD
CY2016Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	62161000	USD
CY2017Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	68296000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	149828000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	188810000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	214344000	USD
CY2016Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	33309000	USD
CY2017Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	32953000	USD
CY2016Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	22709000	USD
CY2017Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	23707000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	15309300000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	15309313000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	18099400000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	18099387000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17200842000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17200800000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20329100000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20329085000	USD
CY2016Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	360300000	USD
CY2017Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	360000000	USD
CY2017	us-gaap	Line Of Credit Facility Expiration Period LineOfCreditFacilityExpirationPeriod	P1Y
CY2016Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2017Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	124704000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	140050000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	22300000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	25300000	USD
CY2016	us-gaap	Loans And Leases Receivable Gain Loss On Sales Net LoansAndLeasesReceivableGainLossOnSalesNet	2500000	USD
CY2017	us-gaap	Loans And Leases Receivable Gain Loss On Sales Net LoansAndLeasesReceivableGainLossOnSalesNet	900000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13189527000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15093935000	USD
CY2015	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2500000	USD
CY2016	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2000000	USD
CY2017	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2400000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	13189527000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	15093935000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	13064823000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	14953885000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	74381000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	16874000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	5918000	USD
CY2015	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	529000	USD
CY2016	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	1056000	USD
CY2017	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	861000	USD
CY2015	us-gaap	Marketing Expense MarketingExpense	2885000	USD
CY2016	us-gaap	Marketing Expense MarketingExpense	3596000	USD
CY2017	us-gaap	Marketing Expense MarketingExpense	3804000	USD
CY2015	us-gaap	Mortgage Loans On Real Estate Foreclosures MortgageLoansOnRealEstateForeclosures	28566000	USD
CY2016	us-gaap	Mortgage Loans On Real Estate Foreclosures MortgageLoansOnRealEstateForeclosures	13110000	USD
CY2017	us-gaap	Mortgage Loans On Real Estate Foreclosures MortgageLoansOnRealEstateForeclosures	1812000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1206272000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2669439000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2703993000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1366443000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2890233000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2955527000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	220415000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	280645000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	383811000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	194244000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	259798000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	325492000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	193494000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	259798000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	325492000	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	1587186000	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	1284557000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	0	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	1764996000	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	12559000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2016Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	5632926000	USD
CY2017Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	7433962000	USD
CY2015	us-gaap	Noninterest Expense NoninterestExpense	260606000	USD
CY2016Q1	us-gaap	Noninterest Expense NoninterestExpense	75493000	USD
CY2016Q2	us-gaap	Noninterest Expense NoninterestExpense	81804000	USD
CY2016Q3	us-gaap	Noninterest Expense NoninterestExpense	85007000	USD
CY2016Q4	us-gaap	Noninterest Expense NoninterestExpense	88645000	USD
CY2016	us-gaap	Noninterest Expense NoninterestExpense	330949000	USD
CY2017Q1	us-gaap	Noninterest Expense NoninterestExpense	87827000	USD
CY2017Q2	us-gaap	Noninterest Expense NoninterestExpense	88420000	USD
CY2017Q3	us-gaap	Noninterest Expense NoninterestExpense	89296000	USD
CY2017Q4	us-gaap	Noninterest Expense NoninterestExpense	95398000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	360941000	USD
CY2015	us-gaap	Noninterest Income NoninterestIncome	29768000	USD
CY2016Q1	us-gaap	Noninterest Income NoninterestIncome	13133000	USD
CY2016Q2	us-gaap	Noninterest Income NoninterestIncome	8559000	USD
CY2016Q3	us-gaap	Noninterest Income NoninterestIncome	10683000	USD
CY2016Q4	us-gaap	Noninterest Income NoninterestIncome	10540000	USD
CY2016	us-gaap	Noninterest Income NoninterestIncome	42915000	USD
CY2017Q1	us-gaap	Noninterest Income NoninterestIncome	10599000	USD
CY2017Q2	us-gaap	Noninterest Income NoninterestIncome	10601000	USD
CY2017Q3	us-gaap	Noninterest Income NoninterestIncome	10456000	USD
CY2017Q4	us-gaap	Noninterest Income NoninterestIncome	13688000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	45344000	USD
CY2015	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2346000	USD
CY2016	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2666000	USD
CY2017	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2237000	USD
CY2016Q4	us-gaap	Notes Receivable Net NotesReceivableNet	13189527000	USD
CY2017Q4	us-gaap	Notes Receivable Net NotesReceivableNet	15093935000	USD
CY2016Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	31	Property
CY2017Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	19	Property
CY2015	us-gaap	Occupancy Net OccupancyNet	22180000	USD
CY2016	us-gaap	Occupancy Net OccupancyNet	27303000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	27860000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	40475000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	10962000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3313000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	4059000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8100000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	11000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4589000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	7894000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	9658000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	10400000	USD
CY2017Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2016	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	637000	USD
CY2017	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	0	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	147234000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	249504000	USD
CY2016Q4	us-gaap	Other Borrowings OtherBorrowings	80000000	USD
CY2017Q4	us-gaap	Other Borrowings OtherBorrowings	390000000	USD
CY2017Q4	us-gaap	Other Commitment Due After Fifth Year OtherCommitmentDueAfterFifthYear	1003173000	USD
CY2017Q4	us-gaap	Other Commitment Due In Fourth And Fifth Year OtherCommitmentDueInFourthAndFifthYear	501635000	USD
CY2017Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	2635947000	USD
CY2017Q4	us-gaap	Other Commitment Due In Second And Third Year OtherCommitmentDueInSecondAndThirdYear	2026121000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-11000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3922000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	15099000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-3973000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-10303000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-26300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	2994000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-10688000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-26955000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1550000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-90000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-31000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-264000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-52000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-18000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-79000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	385000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	655000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1444000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	230000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	404000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	899000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-6117000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-24254000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	6334000	USD
CY2016Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	47800000	USD
CY2017Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	28500000	USD
CY2015	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	522000	USD
CY2016	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	2338000	USD
CY2017	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	6909000	USD
CY2016Q4	us-gaap	Other Liabilities OtherLiabilities	269785000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	333933000	USD
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	24602000	USD
CY2016	us-gaap	Other Noninterest Expense OtherNoninterestExpense	29079000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	32097000	USD
CY2015	us-gaap	Other Real Estate Additions OtherRealEstateAdditions	1407000	USD
CY2015	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	0	USD
CY2016	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	0	USD
CY2017	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	0	USD
CY2015	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1269351000	USD
CY2016	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	810543000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1873387000	USD
CY2015	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	10856000	USD
CY2016	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	10574000	USD
CY2017	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	8862000	USD
CY2015	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	750000	USD
CY2016	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	827002000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1205057000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1429434000	USD
CY2015	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2016	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	92384000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	169400000	USD
CY2015	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	25821000	USD
CY2016	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	7139000	USD
CY2017	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	535000	USD
CY2016Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	763000000	USD
CY2017Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	913700000	USD
CY2015	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	750000	USD
CY2016	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	0	USD
CY2017	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	0	USD
CY2014Q4	us-gaap	Preferred Stock Redemption Amount PreferredStockRedemptionAmount	70700000	USD
CY2015Q4	us-gaap	Preferred Stock Redemption Amount PreferredStockRedemptionAmount	70700000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	28288000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	55785000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	148211000	USD
CY2016	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	169256000	USD
CY2017	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	797000	USD
CY2016	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1710000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	607000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	273950000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	499541000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	430934000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	347000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	395000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	0	USD
CY2015	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-257038000	USD
CY2016	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-66428000	USD
CY2017	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	294289000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	0	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	94000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	6174000	USD
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	132546000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	25504000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	110104000	USD
CY2015	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	45627000	USD
CY2016	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	9133000	USD
CY2017	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	21195000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1935000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1070000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	846000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	189819000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	184584000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	119833000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118719000	USD
CY2015	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3200000	USD
CY2016Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2500000	USD
CY2016Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2500000	USD
CY2016Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2000000	USD
CY2016Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1000000	USD
CY2016	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	8000000	USD
CY2017Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4250000	USD
CY2017Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3000000	USD
CY2017Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5000000	USD
CY2017Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5000000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	17250000	USD
CY2014Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	14271000	USD
CY2015Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	9042000	USD
CY2016Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	6323000	USD
CY2017Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	4012000	USD
CY2016Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	5200000	USD
CY2017Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	8500000	USD
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	385000	USD
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	655000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1444000	USD
CY2016Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	97300000	USD
CY2017Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	100500000	USD
CY2015	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	1000000	USD
CY2017	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	1000000	USD
CY2016	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	-60124000	USD
CY2017	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	-12488000	USD
CY2016Q4	us-gaap	Restricted Investments RestrictedInvestments	65249000	USD
CY2017Q4	us-gaap	Restricted Investments RestrictedInvestments	65785000	USD
CY2015	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	-7603000	USD
CY2016	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	-9483000	USD
CY2017	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	-13811000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	522436000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	848466000	USD
CY2016Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	41728000	USD
CY2017Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	26017000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	25533000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	20338000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	23554000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	121000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	92000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	23.65
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	34.51
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	478000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	531000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	32.00
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	49.06
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1492000	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1278000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1142000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	20.46
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	26.02
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	36.96
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P2Y2M16D
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	571000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	575000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	16.95
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	23.14
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	10500000	shares
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	80000000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	390000000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	28288000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	55785000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	24617000	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	19812000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	23554000	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1935000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1070000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	846000	USD
CY2014	us-gaap	Stock Redeemed Or Called During Period Shares StockRedeemedOrCalledDuringPeriodShares	70500	shares
CY2015	us-gaap	Stock Redeemed Or Called During Period Shares StockRedeemedOrCalledDuringPeriodShares	70500	shares
CY2015	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	-70500000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1000928000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	1591502000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1891500000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1891529000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	2229698000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	2229700000	USD
CY2015Q1	us-gaap	Stockholders Equity StockholdersEquity	1000928000	USD
CY2017Q1	us-gaap	Stockholders Equity StockholdersEquity	1892067000	USD
CY2016Q4	us-gaap	Subordinated Debt SubordinatedDebt	305800000	USD
CY2017Q4	us-gaap	Subordinated Debt SubordinatedDebt	308600000	USD
CY2016Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2017Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2016Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050
CY2017Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050
CY2016Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.060
CY2017Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.060
CY2016Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080
CY2017Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080
CY2017Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	206000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	1655000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	5249000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1457335000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	12636000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	144303000	USD
CY2017Q4	us-gaap	Time Deposits TimeDeposits	1621384000	USD
CY2016Q4	us-gaap	Trade And Loans Receivables Held For Sale Net Not Part Of Disposal Group TradeAndLoansReceivablesHeldForSaleNetNotPartOfDisposalGroup	18909000	USD
CY2017Q4	us-gaap	Trade And Loans Receivables Held For Sale Net Not Part Of Disposal Group TradeAndLoansReceivablesHeldForSaleNetNotPartOfDisposalGroup	0	USD
CY2016Q4	us-gaap	Trading Securities TradingSecurities	1053000	USD
CY2017Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2016	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	31.09
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	51160000
CY2016	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	305046	shares
CY2017	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	269835	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	26362000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	40173000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1038000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1038000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1038000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0.1	USD
CY2015	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0.1	USD
CY2016	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0.1	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	700000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	95219000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	103843000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	104997000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	94570000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103042000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	104179000	shares
CY2015	wal	Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitionsof Loans AccretionAndAmortizationFairMarketValueAdjustmentsRelatingToAcquisitionsofLoans	17144000	USD
CY2016	wal	Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitionsof Loans AccretionAndAmortizationFairMarketValueAdjustmentsRelatingToAcquisitionsofLoans	29209000	USD
CY2017	wal	Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitionsof Loans AccretionAndAmortizationFairMarketValueAdjustmentsRelatingToAcquisitionsofLoans	28235000	USD
CY2015	wal	Accretionand Amortization Fair Market Value Adjustments Relatingto Acquisitionsof Other Assetsand Liabilities AccretionandAmortizationFairMarketValueAdjustmentsRelatingtoAcquisitionsofOtherAssetsandLiabilities	-1279000	USD
CY2016	wal	Accretionand Amortization Fair Market Value Adjustments Relatingto Acquisitionsof Other Assetsand Liabilities AccretionandAmortizationFairMarketValueAdjustmentsRelatingtoAcquisitionsofOtherAssetsandLiabilities	-3098000	USD
CY2017	wal	Accretionand Amortization Fair Market Value Adjustments Relatingto Acquisitionsof Other Assetsand Liabilities AccretionandAmortizationFairMarketValueAdjustmentsRelatingtoAcquisitionsofOtherAssetsandLiabilities	-2385000	USD
CY2017Q4	wal	Additional Collateral Amount AdditionalCollateralAmount	78600000	USD
CY2015	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	14400000	USD
CY2015	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	14437000	USD
CY2016	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	17300000	USD
CY2016	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	17336000	USD
CY2017	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	25355000	USD
CY2017	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	25400000	USD
CY2016Q4	wal	Borrowingsand Qualifying Debt BorrowingsandQualifyingDebt	447900000	USD
CY2017Q4	wal	Borrowingsand Qualifying Debt BorrowingsandQualifyingDebt	766900000	USD
CY2016Q4	wal	Business Combination Fair Market Value Adjustmenton Junior Subordinated Debenture Owedto Unconsolidated Subsidiary Trust BusinessCombinationFairMarketValueAdjustmentonJuniorSubordinatedDebentureOwedtoUnconsolidatedSubsidiaryTrust	-5776000	USD
CY2017Q4	wal	Business Combination Fair Market Value Adjustmenton Junior Subordinated Debenture Owedto Unconsolidated Subsidiary Trust BusinessCombinationFairMarketValueAdjustmentonJuniorSubordinatedDebentureOwedtoUnconsolidatedSubsidiaryTrust	-5465000	USD
CY2015	wal	Cardexpense Cardexpense	1710000	USD
CY2016	wal	Cardexpense Cardexpense	1939000	USD
CY2017	wal	Cardexpense Cardexpense	3413000	USD
CY2016Q4	wal	Cash Cash Equivalentsand Investment Securities CashCashEquivalentsandInvestmentSecurities	3052300000	USD
CY2017Q4	wal	Cash Cash Equivalentsand Investment Securities CashCashEquivalentsandInvestmentSecurities	4237100000	USD
CY2016Q4	wal	Certificatesof Deposit Cdars CertificatesofDepositCDARS	413900000	USD
CY2017Q4	wal	Certificatesof Deposit Cdars CertificatesofDepositCDARS	401400000	USD
CY2015Q4	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	61700000	USD
CY2016Q4	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	65700000	USD
CY2017Q4	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	53600000	USD
CY2016Q4	wal	Common Equity Tier One Required For Capital Adequacy CommonEquityTierOneRequiredForCapitalAdequacy	0.045
CY2017Q4	wal	Common Equity Tier One Required For Capital Adequacy CommonEquityTierOneRequiredForCapitalAdequacy	0.045
CY2016Q4	wal	Common Equity Tier One Required To Be Well Capitalized CommonEquityTierOneRequiredToBeWellCapitalized	0.065
CY2017Q4	wal	Common Equity Tier One Required To Be Well Capitalized CommonEquityTierOneRequiredToBeWellCapitalized	0.065
CY2016Q4	wal	Credit Markon Acquired Loans CreditMarkonAcquiredLoans	47300000	USD
CY2017Q4	wal	Credit Markon Acquired Loans CreditMarkonAcquiredLoans	27000000	USD
CY2016Q4	wal	Deferred Tax Assets Fair Market Value Adjustment Relatedto Acquired Loans DeferredTaxAssetsFairMarketValueAdjustmentRelatedtoAcquiredLoans	7941000	USD
CY2017Q4	wal	Deferred Tax Assets Fair Market Value Adjustment Relatedto Acquired Loans DeferredTaxAssetsFairMarketValueAdjustmentRelatedtoAcquiredLoans	0	USD
CY2016Q4	wal	Deferred Tax Assets Net Unrealized Built In Losses DeferredTaxAssetsNetUnrealizedBuiltInLosses	3251000	USD
CY2017Q4	wal	Deferred Tax Assets Net Unrealized Built In Losses DeferredTaxAssetsNetUnrealizedBuiltInLosses	0	USD
CY2016Q4	wal	Deferred Tax Assets Other Real Estate Owned Write Down DeferredTaxAssetsOtherRealEstateOwnedWriteDown	3230000	USD
CY2017Q4	wal	Deferred Tax Assets Other Real Estate Owned Write Down DeferredTaxAssetsOtherRealEstateOwnedWriteDown	1459000	USD
CY2016Q4	wal	Deferred Tax Assets Start Up Costsand Other Amortization DeferredTaxAssetsStartUpCostsandOtherAmortization	4216000	USD
CY2017Q4	wal	Deferred Tax Assets Start Up Costsand Other Amortization DeferredTaxAssetsStartUpCostsandOtherAmortization	2495000	USD
CY2016Q4	wal	Deferred Tax Liabilities Insurance Premiums DeferredTaxLiabilitiesInsurancePremiums	0	USD
CY2017Q4	wal	Deferred Tax Liabilities Insurance Premiums DeferredTaxLiabilitiesInsurancePremiums	-35789000	USD
CY2016Q4	wal	Deferred Tax Liabilities Unrealized Gainson Debt Instruments Measuredat Fair Value DeferredTaxLiabilitiesUnrealizedGainsonDebtInstrumentsMeasuredatFairValue	-6132000	USD
CY2017Q4	wal	Deferred Tax Liabilities Unrealized Gainson Debt Instruments Measuredat Fair Value DeferredTaxLiabilitiesUnrealizedGainsonDebtInstrumentsMeasuredatFairValue	-2661000	USD
CY2016Q4	wal	Deferred Tax Liabilities Unrealized Gainson Financial Instruments Measuredat Fair Value DeferredTaxLiabilitiesUnrealizedGainsonFinancialInstrumentsMeasuredatFairValue	-2200000	USD
CY2017Q4	wal	Deferred Tax Liabilities Unrealized Gainson Financial Instruments Measuredat Fair Value DeferredTaxLiabilitiesUnrealizedGainsonFinancialInstrumentsMeasuredatFairValue	-1396000	USD
CY2016	wal	Defined Benefit Plan Service Cost Currentand Prior DefinedBenefitPlanServiceCostCurrentandPrior	680000	USD
CY2017	wal	Defined Benefit Plan Service Cost Currentand Prior DefinedBenefitPlanServiceCostCurrentandPrior	580000	USD
CY2017	wal	Defined Contribution Plan Age Of Participants DefinedContributionPlanAgeOfParticipants	P50Y
CY2017	wal	Defined Contribution Plan Initial Percentage Of Discretionary Deferred Compensation DefinedContributionPlanInitialPercentageOfDiscretionaryDeferredCompensation	0.06
CY2016Q4	wal	Deposits Ics DepositsICS	607500000	USD
CY2017Q4	wal	Deposits Ics DepositsICS	617900000	USD
CY2016	wal	Depositscostsdepositswithearningscredits Depositscostsdepositswithearningscredits	4000000	USD
CY2017	wal	Depositscostsdepositswithearningscredits Depositscostsdepositswithearningscredits	8700000	USD
CY2017Q4	wal	Derivative Amountof Hedged Item Loans DerivativeAmountofHedgedItemLoans	699452000	USD
CY2015	wal	Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards DilutiveEffectOfStockOptionsRestrictedStockAndEquitySettledAwards	649000	shares
CY2016	wal	Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards DilutiveEffectOfStockOptionsRestrictedStockAndEquitySettledAwards	801000	shares
CY2017	wal	Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards DilutiveEffectOfStockOptionsRestrictedStockAndEquitySettledAwards	818000	shares
CY2015	wal	Effective Income Tax Reconciliation Excise Tax EffectiveIncomeTaxReconciliationExciseTax	0	USD
CY2016	wal	Effective Income Tax Reconciliation Excise Tax EffectiveIncomeTaxReconciliationExciseTax	0	USD
CY2017	wal	Effective Income Tax Reconciliation Excise Tax EffectiveIncomeTaxReconciliationExciseTax	9689000	USD
CY2016Q4	wal	Excess Funds Providedby Usedin Segment Basis ExcessFundsProvidedbyUsedinSegmentBasis	0	USD
CY2017Q4	wal	Excess Funds Providedby Usedin Segment Basis ExcessFundsProvidedbyUsedinSegmentBasis	0	USD
CY2017Q4	wal	Fair Value Hedge Assets Loans FairValueHedgeAssetsLoans	41919000	USD
CY2016Q4	wal	Financing Receivable Unpaid Principal Balance FinancingReceivableUnpaidPrincipalBalance	13301721000	USD
CY2017Q4	wal	Financing Receivable Unpaid Principal Balance FinancingReceivableUnpaidPrincipalBalance	15202135000	USD
CY2016Q4	wal	Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment FinancingReceivableUnpaidPrincipalBalanceCollectivelyEvaluatedForImpairment	12924164000	USD
CY2017Q4	wal	Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment FinancingReceivableUnpaidPrincipalBalanceCollectivelyEvaluatedForImpairment	14879626000	USD
CY2015	wal	Financing Receivable Waived Fees And Other Expenses FinancingReceivableWaivedFeesAndOtherExpenses	4000	USD
CY2016	wal	Financing Receivable Waived Fees And Other Expenses FinancingReceivableWaivedFeesAndOtherExpenses	0	USD
CY2017	wal	Financing Receivable Waived Fees And Other Expenses FinancingReceivableWaivedFeesAndOtherExpenses	0	USD
CY2015	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Interest Concessions FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToInterestConcessions	3000	USD
CY2016	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Interest Concessions FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToInterestConcessions	0	USD
CY2017	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Interest Concessions FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToInterestConcessions	0	USD
CY2015	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Principal Forgiveness FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToPrincipalForgiveness	0	USD
CY2016	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Principal Forgiveness FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToPrincipalForgiveness	0	USD
CY2017	wal	Financing Receivables Impaired Troubled Debt Restructuring Write Down Due To Principal Forgiveness FinancingReceivablesImpairedTroubledDebtRestructuringWriteDownDueToPrincipalForgiveness	0	USD
CY2014Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	71421000	USD
CY2015Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	52984000	USD
CY2016Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	54138000	USD
CY2017Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	32552000	USD
CY2016Q4	wal	Furniture Fixtures And Equipment Gross FurnitureFixturesAndEquipmentGross	45676000	USD
CY2017Q4	wal	Furniture Fixtures And Equipment Gross FurnitureFixturesAndEquipmentGross	37098000	USD
CY2015	wal	Gain Loss On Foreclosed Assets GainLossOnForeclosedAssets	2628000	USD
CY2016	wal	Gain Loss On Foreclosed Assets GainLossOnForeclosedAssets	-372000	USD
CY2017	wal	Gain Loss On Foreclosed Assets GainLossOnForeclosedAssets	228000	USD
CY2015	wal	Gains Losses On Transfers To Other Real Estate And Foreclosed Assets GainsLossesOnTransfersToOtherRealEstateAndForeclosedAssets	900000	USD
CY2016	wal	Gains Losses On Transfers To Other Real Estate And Foreclosed Assets GainsLossesOnTransfersToOtherRealEstateAndForeclosedAssets	400000	USD
CY2017	wal	Gains Losses On Transfers To Other Real Estate And Foreclosed Assets GainsLossesOnTransfersToOtherRealEstateAndForeclosedAssets	100000	USD
CY2016Q4	wal	Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment ImpairedFinancingReceivableUnpaidPrincipalBalanceIndividuallyEvaluatedForImpairment	175883000	USD
CY2017Q4	wal	Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment ImpairedFinancingReceivableUnpaidPrincipalBalanceIndividuallyEvaluatedForImpairment	177584000	USD
CY2016Q4	wal	Impaired Financing Receivable With No Related Allowance ImpairedFinancingReceivableWithNoRelatedAllowance	0	USD
CY2017Q4	wal	Impaired Financing Receivable With No Related Allowance ImpairedFinancingReceivableWithNoRelatedAllowance	0	USD
CY2016Q4	wal	Impaired Financing Receivables With Norelated Allowance Balanceswith Chargeoffs ImpairedFinancingReceivablesWithNorelatedAllowanceBalanceswithChargeoffs	27600000	USD
CY2017Q4	wal	Impaired Financing Receivables With Norelated Allowance Balanceswith Chargeoffs ImpairedFinancingReceivablesWithNorelatedAllowanceBalanceswithChargeoffs	15600000	USD
CY2015	wal	Income Tax Reconciliation Low Income Housing And Other Tax Credits IncomeTaxReconciliationLowIncomeHousingAndOtherTaxCredits	-5223000	USD
CY2016	wal	Income Tax Reconciliation Low Income Housing And Other Tax Credits IncomeTaxReconciliationLowIncomeHousingAndOtherTaxCredits	-6153000	USD
CY2017	wal	Income Tax Reconciliation Low Income Housing And Other Tax Credits IncomeTaxReconciliationLowIncomeHousingAndOtherTaxCredits	-7361000	USD
CY2015	wal	Income Tax Reconciliation Tax On Earnings Other Than Statutory Tax Rate IncomeTaxReconciliationTaxOnEarningsOtherThanStatutoryTaxRate	-2874000	USD
CY2016	wal	Income Tax Reconciliation Tax On Earnings Other Than Statutory Tax Rate IncomeTaxReconciliationTaxOnEarningsOtherThanStatutoryTaxRate	-3183000	USD
CY2017	wal	Income Tax Reconciliation Tax On Earnings Other Than Statutory Tax Rate IncomeTaxReconciliationTaxOnEarningsOtherThanStatutoryTaxRate	-5739000	USD
CY2015	wal	Incomefrom Equity Investments IncomefromEquityInvestments	564000	USD
CY2016	wal	Incomefrom Equity Investments IncomefromEquityInvestments	2664000	USD
CY2017	wal	Incomefrom Equity Investments IncomefromEquityInvestments	4496000	USD
CY2016Q4	wal	Indefinite Lived Trade Name Gross IndefiniteLivedTradeNameGross	350000	USD
CY2017Q4	wal	Indefinite Lived Trade Name Gross IndefiniteLivedTradeNameGross	350000	USD
CY2016Q4	wal	Interest Bearing Deposit Demand InterestBearingDepositDemand	1346718000	USD
CY2017Q4	wal	Interest Bearing Deposit Demand InterestBearingDepositDemand	1586209000	USD
CY2016Q4	wal	Interest Rateand Credit Markson Acquired Loans InterestRateandCreditMarksonAcquiredLoans	22200000	USD
CY2017Q4	wal	Interest Rateand Credit Markson Acquired Loans InterestRateandCreditMarksonAcquiredLoans	14100000	USD
CY2016Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	187400000	USD
CY2016Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	187378000	USD
CY2017Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	267000000	USD
CY2017Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	267023000	USD
CY2015	wal	Legal Professional And Director Fees LegalProfessionalAndDirectorFees	18548000	USD
CY2016	wal	Legal Professional And Director Fees LegalProfessionalAndDirectorFees	24610000	USD
CY2017	wal	Legal Professional And Director Fees LegalProfessionalAndDirectorFees	29814000	USD
CY2015	wal	Lendingrelatedfees Lendingrelatedfees	1390000	USD
CY2016	wal	Lendingrelatedfees Lendingrelatedfees	5295000	USD
CY2017	wal	Lendingrelatedfees Lendingrelatedfees	2212000	USD
CY2015	wal	Loan And Repossessed Asset Expense LoanAndRepossessedAssetExpense	4377000	USD
CY2016	wal	Loan And Repossessed Asset Expense LoanAndRepossessedAssetExpense	2999000	USD
CY2017	wal	Loan And Repossessed Asset Expense LoanAndRepossessedAssetExpense	4617000	USD
CY2016Q4	wal	Loanand Leases Receivable Commitment Outstanding Related Parties LoanandLeasesReceivableCommitmentOutstandingRelatedParties	46600000	USD
CY2017Q4	wal	Loanand Leases Receivable Commitment Outstanding Related Parties LoanandLeasesReceivableCommitmentOutstandingRelatedParties	31200000	USD
CY2016	wal	Loans And Loans Receivable Purchases LoansAndLoansReceivablePurchases	340600000	USD
CY2017	wal	Loans And Loans Receivable Purchases LoansAndLoansReceivablePurchases	908100000	USD
CY2016	wal	Loansand Leases Receivable Advances Related Parties LoansandLeasesReceivableAdvancesRelatedParties	1980000	USD
CY2017	wal	Loansand Leases Receivable Advances Related Parties LoansandLeasesReceivableAdvancesRelatedParties	1532000	USD
CY2016Q4	wal	Loansand Leases Receivable Including Heldfor Sale Net LoansandLeasesReceivableIncludingHeldforSaleNet	13083800000	USD
CY2017Q4	wal	Loansand Leases Receivable Including Heldfor Sale Net LoansandLeasesReceivableIncludingHeldforSaleNet	14953900000	USD
CY2016Q4	wal	Loansand Leases Receivable Including Heldfor Sale Netof Deferred Income LoansandLeasesReceivableIncludingHeldforSaleNetofDeferredIncome	13208500000	USD
CY2017Q4	wal	Loansand Leases Receivable Including Heldfor Sale Netof Deferred Income LoansandLeasesReceivableIncludingHeldforSaleNetofDeferredIncome	15093900000	USD
CY2017	wal	Maximum Loan To Value Ratio MaximumLoanToValueRatio	0.75
CY2015	wal	Merger Restructure Expense MergerRestructureExpense	8836000	USD
CY2016	wal	Merger Restructure Expense MergerRestructureExpense	12412000	USD
CY2017	wal	Merger Restructure Expense MergerRestructureExpense	0	USD
CY2015	wal	Net Loss Gain On Sales Valuations Of Repossessed Assets And Bank Premises Net NetLossGainOnSalesValuationsOfRepossessedAssetsAndBankPremisesNet	-2070000	USD
CY2016	wal	Net Loss Gain On Sales Valuations Of Repossessed Assets And Bank Premises Net NetLossGainOnSalesValuationsOfRepossessedAssetsAndBankPremisesNet	-125000	USD
CY2017	wal	Net Loss Gain On Sales Valuations Of Repossessed Assets And Bank Premises Net NetLossGainOnSalesValuationsOfRepossessedAssetsAndBankPremisesNet	-80000	USD
CY2015	wal	Non Interest Expense Deposit Costs NonInterestExpenseDepositCosts	907000	USD
CY2016	wal	Non Interest Expense Deposit Costs NonInterestExpenseDepositCosts	4983000	USD
CY2017	wal	Non Interest Expense Deposit Costs NonInterestExpenseDepositCosts	9731000	USD
CY2016Q4	wal	Non Performing Assets NonPerformingAssets	142791000	USD
CY2017Q4	wal	Non Performing Assets NonPerformingAssets	114939000	USD
CY2016Q4	wal	Non Performing Loans NonPerformingLoans	94976000	USD
CY2017Q4	wal	Non Performing Loans NonPerformingLoans	86399000	USD
CY2016Q4	wal	Noninterestbearingdepositearningscredit Noninterestbearingdepositearningscredit	1100000000	USD
CY2017Q4	wal	Noninterestbearingdepositearningscredit Noninterestbearingdepositearningscredit	1850000000	USD
CY2016Q4	wal	Number Of Securities In Unrealized Position NumberOfSecuritiesInUnrealizedPosition	244	positions
CY2017Q4	wal	Number Of Securities In Unrealized Position NumberOfSecuritiesInUnrealizedPosition	302	positions
CY2017	wal	Number Of Unconsolidated Subsidiaries NumberOfUnconsolidatedSubsidiaries	8	Subsidiary
CY2016Q4	wal	Other Assets Segment OtherAssetsSegment	714000000	USD
CY2017Q4	wal	Other Assets Segment OtherAssetsSegment	808900000	USD
CY2015	wal	Other Comprehensive Income Loss Unrealized Gain Losson Debt Carriedat Fair Value Tax OtherComprehensiveIncomeLossUnrealizedGainLossonDebtCarriedatFairValueTax	2679000	USD
CY2016	wal	Other Comprehensive Income Loss Unrealized Gain Losson Debt Carriedat Fair Value Tax OtherComprehensiveIncomeLossUnrealizedGainLossonDebtCarriedatFairValueTax	1405000	USD
CY2017	wal	Other Comprehensive Income Loss Unrealized Gain Losson Debt Carriedat Fair Value Tax OtherComprehensiveIncomeLossUnrealizedGainLossonDebtCarriedatFairValueTax	2220000	USD
CY2015	wal	Other Comprehensive Income Loss Unrealized Gain Losson Junior Subordinated Debt Carriedat Fair Value OtherComprehensiveIncomeLossUnrealizedGainLossonJuniorSubordinatedDebtCarriedatFairValue	-4276000	USD
CY2016	wal	Other Comprehensive Income Loss Unrealized Gain Losson Junior Subordinated Debt Carriedat Fair Value OtherComprehensiveIncomeLossUnrealizedGainLossonJuniorSubordinatedDebtCarriedatFairValue	-2077000	USD
CY2017	wal	Other Comprehensive Income Loss Unrealized Gain Losson Junior Subordinated Debt Carriedat Fair Value OtherComprehensiveIncomeLossUnrealizedGainLossonJuniorSubordinatedDebtCarriedatFairValue	-3604000	USD
CY2016Q4	wal	Other Liabilities Segment OtherLiabilitiesSegment	311600000	USD
CY2017Q4	wal	Other Liabilities Segment OtherLiabilitiesSegment	360000000	USD
CY2015Q4	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	15500000	USD
CY2016Q4	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	24300000	USD
CY2017Q4	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	25000000	USD
CY2016Q4	wal	Percentage Of Commercial Real Estate Loans Occupied By Owners PercentageOfCommercialRealEstateLoansOccupiedByOwners	0.362
CY2017Q4	wal	Percentage Of Commercial Real Estate Loans Occupied By Owners PercentageOfCommercialRealEstateLoansOccupiedByOwners	0.36
CY2015	wal	Proceeds From Sale Of Other Real Estate Owned Gross ProceedsFromSaleOfOtherRealEstateOwnedGross	51038000	USD
CY2016	wal	Proceeds From Sale Of Other Real Estate Owned Gross ProceedsFromSaleOfOtherRealEstateOwnedGross	11584000	USD
CY2017	wal	Proceeds From Sale Of Other Real Estate Owned Gross ProceedsFromSaleOfOtherRealEstateOwnedGross	23626000	USD
CY2015	wal	Proceeds From Sale Of Other Real Estate Owned Net ProceedsFromSaleOfOtherRealEstateOwnedNet	45627000	USD
CY2016	wal	Proceeds From Sale Of Other Real Estate Owned Net ProceedsFromSaleOfOtherRealEstateOwnedNet	9133000	USD
CY2017	wal	Proceeds From Sale Of Other Real Estate Owned Net ProceedsFromSaleOfOtherRealEstateOwnedNet	21195000	USD
CY2015	wal	Proceeds From Sale Of Other Real Estate Owned Valuation Allowance ProceedsFromSaleOfOtherRealEstateOwnedValuationAllowance	5411000	USD
CY2016	wal	Proceeds From Sale Of Other Real Estate Owned Valuation Allowance ProceedsFromSaleOfOtherRealEstateOwnedValuationAllowance	2451000	USD
CY2017	wal	Proceeds From Sale Of Other Real Estate Owned Valuation Allowance ProceedsFromSaleOfOtherRealEstateOwnedValuationAllowance	2431000	USD
CY2015	wal	Proceeds From Sale Of Securities Measured At Fair Value ProceedsFromSaleOfSecuritiesMeasuredAtFairValue	0	USD
CY2016	wal	Proceeds From Sale Of Securities Measured At Fair Value ProceedsFromSaleOfSecuritiesMeasuredAtFairValue	0	USD
CY2017	wal	Proceeds From Sale Of Securities Measured At Fair Value ProceedsFromSaleOfSecuritiesMeasuredAtFairValue	994000	USD
CY2016	wal	Proceedsfrom Issuanceof Common Stock Gross ProceedsfromIssuanceofCommonStockGross	56800000	USD
CY2015	wal	Proceedsfrom Sale Paymentsto Purchase Investment In Money Market ProceedsfromSalePaymentstoPurchaseInvestmentInMoneyMarket	330000	USD
CY2016	wal	Proceedsfrom Sale Paymentsto Purchase Investment In Money Market ProceedsfromSalePaymentstoPurchaseInvestmentInMoneyMarket	121000	USD
CY2017	wal	Proceedsfrom Sale Paymentsto Purchase Investment In Money Market ProceedsfromSalePaymentstoPurchaseInvestmentInMoneyMarket	0	USD
CY2015	wal	Purchase Of Investment Tax Credits PurchaseOfInvestmentTaxCredits	29437000	USD
CY2016	wal	Purchase Of Investment Tax Credits PurchaseOfInvestmentTaxCredits	28847000	USD
CY2017	wal	Purchase Of Investment Tax Credits PurchaseOfInvestmentTaxCredits	38098000	USD
CY2015	wal	Purchaseof Sbic Investments PurchaseofSBICInvestments	0	USD
CY2016	wal	Purchaseof Sbic Investments PurchaseofSBICInvestments	0	USD
CY2017	wal	Purchaseof Sbic Investments PurchaseofSBICInvestments	5819000	USD
CY2016Q4	wal	Qualifying Debt QualifyingDebt	367937000	USD
CY2017Q4	wal	Qualifying Debt QualifyingDebt	376905000	USD
CY2015	wal	Redemption Of Preferred Stock RedemptionOfPreferredStock	70500000	USD
CY2016	wal	Redemption Of Preferred Stock RedemptionOfPreferredStock	0	USD
CY2017	wal	Redemption Of Preferred Stock RedemptionOfPreferredStock	0	USD
CY2015	wal	Restrictedstocksurrendered Restrictedstocksurrendered	7603000	USD
CY2016	wal	Restrictedstocksurrendered Restrictedstocksurrendered	9483000	USD
CY2017	wal	Restrictedstocksurrendered Restrictedstocksurrendered	13811000	USD
CY2016Q4	wal	Time Deposits250000ormore TimeDeposits250000ormore	609678000	USD
CY2017Q4	wal	Time Deposits250000ormore TimeDeposits250000ormore	713654000	USD
CY2016Q4	wal	Time Deposits Lessthan250000 TimeDepositsLessthan250000	839664000	USD
CY2017Q4	wal	Time Deposits Lessthan250000 TimeDepositsLessthan250000	907730000	USD
CY2016Q4	wal	Trade Name Impaired Accumulated Impairment Loss TradeNameImpairedAccumulatedImpairmentLoss	0	USD
CY2017Q4	wal	Trade Name Impaired Accumulated Impairment Loss TradeNameImpairedAccumulatedImpairmentLoss	0	USD
CY2016Q4	wal	Troubled Debt Restructured Loans TroubledDebtRestructuredLoans	53637000	USD
CY2017Q4	wal	Troubled Debt Restructured Loans TroubledDebtRestructuredLoans	42431000	USD
CY2015	wal	Unfunded Commitments To Purchase Investment Tax Credits UnfundedCommitmentsToPurchaseInvestmentTaxCredits	39617000	USD
CY2016	wal	Unfunded Commitments To Purchase Investment Tax Credits UnfundedCommitmentsToPurchaseInvestmentTaxCredits	56479000	USD
CY2017	wal	Unfunded Commitments To Purchase Investment Tax Credits UnfundedCommitmentsToPurchaseInvestmentTaxCredits	123012000	USD
CY2016Q4	wal	Unfunded Low Income Housing Tax Credit Obligations UnfundedLowIncomeHousingTaxCreditObligations	84400000	USD
CY2017Q4	wal	Unfunded Low Income Housing Tax Credit Obligations UnfundedLowIncomeHousingTaxCreditObligations	151300000	USD
CY2015	wal	Valuation Adjustments Of Other Repossessed Assets Net ValuationAdjustmentsOfOtherRepossessedAssetsNet	-182000	USD
CY2016	wal	Valuation Adjustments Of Other Repossessed Assets Net ValuationAdjustmentsOfOtherRepossessedAssetsNet	268000	USD
CY2017	wal	Valuation Adjustments Of Other Repossessed Assets Net ValuationAdjustmentsOfOtherRepossessedAssetsNet	-120000	USD
CY2015	wal	Valuation Adjustments Of Other Repossessed Assets Valuation Allowance ValuationAdjustmentsOfOtherRepossessedAssetsValuationAllowance	182000	USD
CY2016	wal	Valuation Adjustments Of Other Repossessed Assets Valuation Allowance ValuationAdjustmentsOfOtherRepossessedAssetsValuationAllowance	-268000	USD
CY2017	wal	Valuation Adjustments Of Other Repossessed Assets Valuation Allowance ValuationAdjustmentsOfOtherRepossessedAssetsValuationAllowance	120000	USD
CY2016	wal	Weighted Average Selling Price Per Share WeightedAverageSellingPricePerShare	36.63
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain amounts reported in prior periods may have been reclassified in the Consolidated Financial Statements to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of estimates</font></div><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and certain assets and liabilities carried at fair value; and accounting for income taxes. </font></div></div>

Files In Submission

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wal-20171231_cal.xml	Edgar Link	unprocessable
wal-20171231_def.xml	Edgar Link	unprocessable
wal-20171231_lab.xml	Edgar Link	unprocessable
wal-20171231_pre.xml	Edgar Link	unprocessable
wal1231201710-k.htm	Edgar Link	pending
walex31110k12312017.htm	Edgar Link	pending
walex31210k12312017.htm	Edgar Link	pending
walex3210k12312017.htm	Edgar Link	pending

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$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal

2016 Q4 Form 10-K Financial Statement

#000121254518000091 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAL WESTERN ALLIANCE BANCORPORATION Stock $wal

2016 Q4 Form 10-K Financial Statement

#000121254518000091 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal