$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal

$wal Overview Financials Valuation SEC Filings Company Website

2018 Q1 Form 10-Q Financial Statement

#000121254518000141 Filed on April 27, 2018

Income Statement

Concept	2018 Q1	2017 Q1
Revenue	$234.7M	$192.3M
YoY Change	22.07%	24.64%
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	$3.400M	$3.200M
YoY Change	6.25%	23.08%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$20.48M	$12.96M
YoY Change	58.05%	51.62%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$121.7M	$97.83M
YoY Change	24.41%	21.0%
Income Tax	$20.81M	$24.49M
% Of Pretax Income	17.1%	25.03%
Net Earnings	$100.9M	$73.34M
YoY Change	37.57%	19.58%
Net Earnings / Revenue	42.99%	38.15%
Basic Earnings Per Share	$0.97	$0.71
Diluted Earnings Per Share	$0.96	$0.70
COMMON SHARES
Basic Shares Outstanding	104.5M shares	104.0M shares
Diluted Shares Outstanding	105.3M shares	104.8M shares

Balance Sheet

Concept	2018 Q1	2017 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$439.4M	$647.0M
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	$116.7M	$120.0M
YoY Change	-2.78%	0.23%
Goodwill	$289.9M	$289.9M
YoY Change	0.0%	0.33%
Intangibles	$10.46M	$12.24M
YoY Change	-14.57%	-18.52%
Long-Term Investments
YoY Change
Other Assets	$27.00M	$88.00M
YoY Change	-69.32%	18.92%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$20.76B	$18.12B
YoY Change	14.56%	18.85%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$300.0M	$0.00
YoY Change		-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$22.00M	$36.00M
YoY Change	-38.89%	0.0%
LONG-TERM LIABILITIES
Long-Term Debt	$664.0M	$367.0M
YoY Change	80.93%	74.76%
Other Long-Term Liabilities	$427.0M	$395.0M
YoY Change	8.1%	52.51%
Total Long-Term Liabilities	$1.091B	$762.0M
YoY Change	43.18%	62.47%
TOTAL LIABILITIES
Total Short-Term Liabilities	$22.00M	$36.00M
Total Long-Term Liabilities	$1.091B	$762.0M
Total Liabilities	$18.47B	$16.15B
YoY Change	14.32%	18.88%
SHAREHOLDERS EQUITY
Retained Earnings	$950.4M	$595.8M
YoY Change	59.52%	83.9%
Common Stock	$10.00K	$10.00K
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$46.47M	$36.61M
YoY Change	26.95%	-241.73%
Treasury Stock Shares
Shareholders Equity	$2.614B	$1.892B
YoY Change
Total Liabilities & Shareholders Equity	$20.76B	$18.12B
YoY Change	14.56%	18.85%

Cashflow Statement

Concept	2018 Q1	2017 Q1
OPERATING ACTIVITIES
Net Income	$100.9M	$73.34M
YoY Change	37.57%	19.58%
Depreciation, Depletion And Amortization	$3.400M	$3.200M
YoY Change	6.25%	23.08%
Cash From Operating Activities	$88.32M	$87.97M
YoY Change	0.39%	23.36%
INVESTING ACTIVITIES
Capital Expenditures	-$600.0K	-$2.600M
YoY Change	-76.92%	-16.13%
Acquisitions
YoY Change
Other Investing Activities	-$346.7M	-$432.9M
YoY Change	-19.91%	184.06%
Cash From Investing Activities	-$347.3M	-$435.5M
YoY Change	-20.25%	180.01%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$281.6M	$710.0M
YoY Change	-60.34%	-20.27%
NET CHANGE
Cash From Operating Activities	$88.32M	$87.97M
Cash From Investing Activities	-$347.3M	-$435.5M
Cash From Financing Activities	$281.6M	$710.0M
Net Change In Cash	$22.60M	$362.5M
YoY Change	-93.77%	-55.04%
FREE CASH FLOW
Cash From Operating Activities	$88.32M	$87.97M
Capital Expenditures	-$600.0K	-$2.600M
Free Cash Flow	$88.92M	$90.57M
YoY Change	-1.83%	21.71%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q1	invest	Derivative Notional Amount DerivativeNotionalAmount	1035151000	USD
CY2017Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	993432000	USD
CY2017Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4007000	USD
CY2018Q1	dei	Amendment Flag AmendmentFlag	false
CY2018Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2018Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018Q1	dei	Document Period End Date DocumentPeriodEndDate	2018-03-31
CY2018Q1	dei	Document Type DocumentType	10-Q
CY2018Q1	dei	Entity Central Index Key EntityCentralIndexKey	0001212545
CY2018Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	105860364	shares
CY2018Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q1	dei	Entity Registrant Name EntityRegistrantName	WESTERN ALLIANCE BANCORPORATION
CY2018Q1	dei	Trading Symbol TradingSymbol	WAL
CY2018Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3920000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4695000	USD
CY2017Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2851000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3145000	USD
CY2018Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-41662000	USD
CY2018Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4203000	USD
CY2017Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1424540000	USD
CY2018Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1431460000	USD
CY2017Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	689000	USD
CY2018Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	398000	USD
CY2018Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017Q4	us-gaap	Assets Assets	20329085000	USD
CY2018Q1	us-gaap	Assets Assets	20760731000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3515401000	USD
CY2018Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3474049000	USD
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3499519000	USD
CY2018Q1	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3405462000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	35733000	USD
CY2018Q1	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	27119000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	51615000	USD
CY2018Q1	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	95706000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3515401000	USD
CY2018Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3474049000	USD
CY2017Q1	us-gaap	Available For Sale Securities Change In Net Unrealized Holding Gain Loss Net Of Tax AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax	9169000	USD
CY2018Q1	us-gaap	Available For Sale Securities Change In Net Unrealized Holding Gain Loss Net Of Tax AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax	-38914000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	32885000	USD
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CY2018Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	95706000	USD
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CY2018Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	3053817000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	18730000	USD
CY2018Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	46119000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1593514000	USD
CY2018Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	2020702000	USD
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CY2018Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	256070000	USD
CY2018Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	251220000	USD
CY2018Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	15947000	USD
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CY2018Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	519543000	USD
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CY2017Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	167764000	USD
CY2018Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	168619000	USD
CY2017Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	948000	USD
CY2018Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	928000	USD
CY2017Q1	us-gaap	Business Development BusinessDevelopment	2063000	USD
CY2018Q1	us-gaap	Business Development BusinessDevelopment	1728000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	284491000	USD
CY2017Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	647034000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	416768000	USD
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CY2018Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
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CY2017Q4	us-gaap	Common Stock Value CommonStockValue	10000	USD
CY2018Q1	us-gaap	Common Stock Value CommonStockValue	10000	USD
CY2017Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	80888000	USD
CY2018Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	63441000	USD
CY2017Q1	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	6397000	USD
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CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	132813000	USD
CY2018Q1	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	138268000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5606000	USD
CY2018Q1	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5562000	USD
CY2017Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	-1438000	USD
CY2018Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	-2233000	USD
CY2017Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2743000	USD
CY2018Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3624000	USD
CY2017Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	14879626000	USD
CY2018Q1	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	15352070000	USD
CY2017Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	98554000	USD
CY2018Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	97592000	USD
CY2017Q1	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1
CY2018Q1	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5
CY2017Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4900000	USD
CY2018Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	15000000	USD
CY2017Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	TDRs
CY2018Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2017Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	100000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	43000	USD
CY2018Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	37000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	15061371000	USD
CY2018Q1	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	15538812000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	43925000	USD
CY2018Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	37297000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	32564000	USD
CY2018Q1	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	21641000	USD
CY2017Q1	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	9200000	USD
CY2018Q1	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	31000000	USD
CY2016Q4	us-gaap	Foreclosed Assets ForeclosedAssets	47815000	USD
CY2017Q1	us-gaap	Foreclosed Assets ForeclosedAssets	45200000	USD
CY2017Q4	us-gaap	Foreclosed Assets ForeclosedAssets	28540000	USD
CY2018Q1	us-gaap	Foreclosed Assets ForeclosedAssets	30194000	USD
CY2017Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1042000	USD
CY2018Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1202000	USD
CY2017Q1	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-47000	USD
CY2018Q1	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	33000	USD
CY2017Q1	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	635000	USD
CY2018Q1	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2017Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	635000	USD
CY2018Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
CY2017Q1	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	-52000	USD
CY2018Q1	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	678000	USD
CY2017Q1	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	636000	USD
CY2018Q1	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	0	USD
CY2017Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-106000	USD
CY2018Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1242000	USD
CY2017Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	3228000	USD
CY2018Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	3869000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	289895000	USD
CY2018Q1	us-gaap	Goodwill Goodwill	289895000	USD
CY2017Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	255050000	USD
CY2018Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	262304000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	4514000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	795000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	3250000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	7681000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2018Q1	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 Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	3250000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	7681000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	107921000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	208272000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3250000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7681000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	107921000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	208272000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2018Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	14475000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	14847000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	10206000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	10100000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	229529000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	236157000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	1208000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	1200000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	256314000	USD
CY2018Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	255418000	USD
CY2017Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	103387000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	93081000	USD
CY2017Q1	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	921000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	873000	USD
CY2017Q1	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	332000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	438000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	98554000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	97592000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5606000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5562000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	79239000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	87994000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	156789000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	167192000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	19315000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	9598000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	20795000	USD
CY2018Q1	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	12423000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97831000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	121714000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24489000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20814000	USD
CY2017Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	-23000	USD
CY2018Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	9881000	USD
CY2018Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	21600000	USD
CY2017Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	806106000	USD
CY2018Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	382006000	USD
CY2017Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4864000	USD
CY2018Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-9744000	USD
CY2017Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4398000	USD
CY2018Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-30122000	USD
CY2017Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5264000	USD
CY2018Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5207000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10853000	USD
CY2018Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10455000	USD
CY2017Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	300700000	USD
CY2018Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	300400000	USD
CY2017Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	192265000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	234697000	USD
CY2017Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	7000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	0	USD
CY2017Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	172553000	USD
CY2018Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	205959000	USD
CY2017Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9538570000	USD
CY2018Q1	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9852502000	USD
CY2017Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	235577000	USD
CY2018Q1	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	289634000	USD
CY2017Q1	us-gaap	Interest Expense InterestExpense	12956000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	20477000	USD
CY2017Q1	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	190000	USD
CY2018Q1	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	1326000	USD
CY2017Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	-749000	USD
CY2018Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	-904000	USD
CY2017Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	8412000	USD
CY2018Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	14173000	USD
CY2017Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	16000	USD
CY2018Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	9000	USD
CY2017Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	4338000	USD
CY2018Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	4969000	USD
CY2017Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	175059000	USD
CY2018Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	208220000	USD
CY2017Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	179309000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	214220000	USD
CY2017Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	16571000	USD
CY2018Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	25772000	USD
CY2017Q1	us-gaap	Interest Paid InterestPaid	17851000	USD
CY2018Q1	us-gaap	Interest Paid InterestPaid	25303000	USD
CY2017Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	68300000	USD
CY2018Q1	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	66400000	USD
CY2017Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	51620000	USD
CY2018Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	62133000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	18099400000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	18099387000	USD
CY2018Q1	us-gaap	Liabilities Liabilities	18466968000	USD
CY2018Q1	us-gaap	Liabilities Liabilities	18467000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20329100000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20329085000	USD
CY2018Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20760731000	USD
CY2018Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20760700000	USD
CY2018Q1	us-gaap	Line Of Credit Facility Expiration Period LineOfCreditFacilityExpirationPeriod	P1Y
CY2017Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2018Q1	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	140050000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	144659000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	25300000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	32600000	USD
CY2017Q1	us-gaap	Loans And Leases Receivable Gain Loss On Sales Net LoansAndLeasesReceivableGainLossOnSalesNet	100000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Gain Loss On Sales Net LoansAndLeasesReceivableGainLossOnSalesNet	700000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15093935000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15560453000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	600000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	15093935000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	15560453000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	14953885000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	15415794000	USD
CY2017Q1	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	1000	USD
CY2018Q1	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	0	USD
CY2017Q1	us-gaap	Marketing Expense MarketingExpense	721000	USD
CY2018Q1	us-gaap	Marketing Expense MarketingExpense	596000	USD
CY2017Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	0	USD
CY2018Q1	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	5000	USD
CY2017Q1	us-gaap	Mortgage Loans On Real Estate Foreclosures MortgageLoansOnRealEstateForeclosures	0	USD
CY2018Q1	us-gaap	Mortgage Loans On Real Estate Foreclosures MortgageLoansOnRealEstateForeclosures	5744000	USD
CY2017Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	710030000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	281585000	USD
CY2017Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-435459000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-347298000	USD
CY2017Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	87972000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	88316000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	73342000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	100900000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	73342000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	100900000	USD
CY2017Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	7433962000	USD
CY2018Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	7502036000	USD
CY2017Q1	us-gaap	Noninterest Expense NoninterestExpense	87827000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	98149000	USD
CY2017Q1	us-gaap	Noninterest Income NoninterestIncome	10599000	USD
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	11643000	USD
CY2017Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	631000	USD
CY2018Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	432000	USD
CY2017Q4	us-gaap	Notes Receivable Net NotesReceivableNet	15093935000	USD
CY2018Q1	us-gaap	Notes Receivable Net NotesReceivableNet	15560453000	USD
CY2017Q1	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	25	Property
CY2017Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	19	Property
CY2018Q1	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	18	Property
CY2017Q1	us-gaap	Occupancy Net OccupancyNet	6894000	USD
CY2018Q1	us-gaap	Occupancy Net OccupancyNet	6864000	USD
CY2017Q1	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2600000	USD
CY2018Q1	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2500000	USD
CY2017Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2018Q1	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	249504000	USD
CY2018Q1	us-gaap	Other Assets OtherAssets	239126000	USD
CY2017Q4	us-gaap	Other Borrowings OtherBorrowings	390000000	USD
CY2018Q1	us-gaap	Other Borrowings OtherBorrowings	300000000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-5670000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	12714000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	7939000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-37459000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7546000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-37459000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	11000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2000	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	393000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2017Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	242000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2017Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	9169000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-38914000	USD
CY2017Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	28500000	USD
CY2018Q1	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	30200000	USD
CY2017Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	912000	USD
CY2018Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	1488000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	333933000	USD
CY2018Q1	us-gaap	Other Liabilities OtherLiabilities	426819000	USD
CY2017Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5338000	USD
CY2018Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8128000	USD
CY2017Q1	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
CY2018Q1	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
CY2017Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	342069000	USD
CY2018Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	367437000	USD
CY2017Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	2575000	USD
CY2018Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	576000	USD
CY2017Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	185199000	USD
CY2018Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	67949000	USD
CY2017Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	10533000	USD
CY2018Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	7800000	USD
CY2017Q1	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	154000	USD
CY2018Q1	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	734000	USD
CY2017Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	913700000	USD
CY2018Q1	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	1010000000	USD
CY2017Q1	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2018Q1	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	72000	USD
CY2017Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	90585000	USD
CY2018Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	105242000	USD
CY2017Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	33000	USD
CY2018Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	0	USD
CY2017Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-86017000	USD
CY2018Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-94340000	USD
CY2017Q1	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	0	USD
CY2018Q1	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	243000	USD
CY2017Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	15170000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2017Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	2889000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	5285000	USD
CY2017Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	184000	USD
CY2018Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	215000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118719000	USD
CY2018Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	116702000	USD
CY2017Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4250000	USD
CY2018Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6000000	USD
CY2016Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	6323000	USD
CY2017Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	5719000	USD
CY2017Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	4012000	USD
CY2018Q1	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	4050000	USD
CY2017Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	8500000	USD
CY2018Q1	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	8000000	USD
CY2017Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	393000	USD
CY2018Q1	wal	Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitionsof Loans AccretionAndAmortizationFairMarketValueAdjustmentsRelatingToAcquisitionsofLoans	5738000	USD
CY2017Q1	wal	Accretionand Amortization Fair Market Value Adjustments Relatingto Acquisitionsof Other Assetsand Liabilities AccretionandAmortizationFairMarketValueAdjustmentsRelatingtoAcquisitionsofOtherAssetsandLiabilities	-767000	USD
CY2018Q1	wal	Accretionand Amortization Fair Market Value Adjustments Relatingto Acquisitionsof Other Assetsand Liabilities AccretionandAmortizationFairMarketValueAdjustmentsRelatingtoAcquisitionsofOtherAssetsandLiabilities	-475000	USD
CY2018Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2017Q1	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	1500000	USD
CY2018Q1	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	500000	USD
CY2017Q4	us-gaap	Restricted Investments RestrictedInvestments	65785000	USD
CY2018Q1	us-gaap	Restricted Investments RestrictedInvestments	66519000	USD
CY2017Q1	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	-10243000	USD
CY2018Q1	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	-6296000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	848466000	USD
CY2018Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	950424000	USD
CY2017Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	26017000	USD
CY2018Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	21676000	USD
CY2017Q1	us-gaap	Share Based Compensation ShareBasedCompensation	6342000	USD
CY2018Q1	us-gaap	Share Based Compensation ShareBasedCompensation	6705000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	390000000	USD
CY2018Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	300000000	USD
CY2017Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	6619000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	6705000	USD
CY2017Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	184000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	215000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1891529000	USD
CY2017Q1	us-gaap	Stockholders Equity StockholdersEquity	1969515000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	2229698000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	2229700000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	2293763000	USD
CY2017Q1	us-gaap	Stockholders Equity StockholdersEquity	1892067000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	2229698000	USD
CY2017Q4	us-gaap	Subordinated Debt SubordinatedDebt	308600000	USD
CY2018Q1	us-gaap	Subordinated Debt SubordinatedDebt	297500000	USD
CY2017Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	50.88
CY2018Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	59.02
CY2017Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	201306	shares
CY2018Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	180867	shares
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	40173000	USD
CY2018Q1	us-gaap	Treasury Stock Value TreasuryStockValue	46469000	USD
CY2017Q1	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-1000	USD
CY2018Q1	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-1074000	USD
CY2017Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	104836000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105324000	shares
CY2017Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103987000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	104530000	shares
CY2017Q1	wal	Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitionsof Loans AccretionAndAmortizationFairMarketValueAdjustmentsRelatingToAcquisitionsofLoans	6393000	USD
CY2018Q1	wal	Additional Collateral Amount AdditionalCollateralAmount	52200000	USD
CY2017Q1	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	5931000	USD
CY2017Q1	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	5900000	USD
CY2017Q4	wal	Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment ImpairedFinancingReceivableUnpaidPrincipalBalanceIndividuallyEvaluatedForImpairment	177584000	USD
CY2018Q1	wal	Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment ImpairedFinancingReceivableUnpaidPrincipalBalanceIndividuallyEvaluatedForImpairment	179615000	USD
CY2018Q1	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	8100000	USD
CY2018Q1	wal	Amortizationof Low Income Housing Tax Credits AmortizationofLowIncomeHousingTaxCredits	8128000	USD
CY2017Q4	wal	Borrowingsand Qualifying Debt BorrowingsandQualifyingDebt	766900000	USD
CY2018Q1	wal	Borrowingsand Qualifying Debt BorrowingsandQualifyingDebt	663900000	USD
CY2017Q1	wal	Cardexpense Cardexpense	731000	USD
CY2018Q1	wal	Cardexpense Cardexpense	942000	USD
CY2017Q4	wal	Cash Cash Equivalentsand Investment Securities CashCashEquivalentsandInvestmentSecurities	4237100000	USD
CY2018Q1	wal	Cash Cash Equivalentsand Investment Securities CashCashEquivalentsandInvestmentSecurities	4173700000	USD
CY2017Q1	wal	Changein Unfunded Obligations Non Cash ChangeinUnfundedObligationsNonCash	114727000	USD
CY2018Q1	wal	Changein Unfunded Obligations Non Cash ChangeinUnfundedObligationsNonCash	120512000	USD
CY2017Q1	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	59100000	USD
CY2017Q4	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	53600000	USD
CY2018Q1	wal	Collateral Netted Against Derivative Liabilities CollateralNettedAgainstDerivativeLiabilities	40100000	USD
CY2017Q4	wal	Credit Markon Acquired Loans CreditMarkonAcquiredLoans	27000000	USD
CY2018Q1	wal	Credit Markon Acquired Loans CreditMarkonAcquiredLoans	23100000	USD
CY2017Q1	wal	Debitandcreditcardinterchangefees Debitandcreditcardinterchangefees	1215000	USD
CY2018Q1	wal	Debitandcreditcardinterchangefees Debitandcreditcardinterchangefees	1508000	USD
CY2017Q4	wal	Derivative Amountof Hedged Item Loans DerivativeAmountofHedgedItemLoans	699452000	USD
CY2018Q1	wal	Derivative Amountof Hedged Item Loans DerivativeAmountofHedgedItemLoans	671363000	USD
CY2017Q1	wal	Derivative Instruments Notional Amount Netting Adjustments DerivativeInstrumentsNotionalAmountNettingAdjustments	0	USD
CY2017Q4	wal	Derivative Instruments Notional Amount Netting Adjustments DerivativeInstrumentsNotionalAmountNettingAdjustments	0	USD
CY2017Q1	wal	Derivative Netting Adjustments DerivativeNettingAdjustments	-1947000	USD
CY2017Q4	wal	Derivative Netting Adjustments DerivativeNettingAdjustments	-896000	USD
CY2017Q1	wal	Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards DilutiveEffectOfStockOptionsRestrictedStockAndEquitySettledAwards	849000	shares
CY2018Q1	wal	Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards DilutiveEffectOfStockOptionsRestrictedStockAndEquitySettledAwards	794000	shares
CY2017Q4	wal	Excess Funds Providedby Usedin Segment Basis ExcessFundsProvidedbyUsedinSegmentBasis	0	USD
CY2018Q1	wal	Excess Funds Providedby Usedin Segment Basis ExcessFundsProvidedbyUsedinSegmentBasis	0	USD
CY2017Q4	wal	Fair Value Hedge Assets Loans FairValueHedgeAssetsLoans	41919000	USD
CY2018Q1	wal	Fair Value Hedge Assets Loans FairValueHedgeAssetsLoans	18063000	USD
CY2017Q4	wal	Financing Receivable Unpaid Principal Balance FinancingReceivableUnpaidPrincipalBalance	15202135000	USD
CY2018Q1	wal	Financing Receivable Unpaid Principal Balance FinancingReceivableUnpaidPrincipalBalance	15671560000	USD
CY2017Q4	wal	Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment FinancingReceivableUnpaidPrincipalBalanceCollectivelyEvaluatedForImpairment	14879626000	USD
CY2018Q1	wal	Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment FinancingReceivableUnpaidPrincipalBalanceCollectivelyEvaluatedForImpairment	15352070000	USD
CY2016Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	54138000	USD
CY2017Q1	wal	Foreclosed Assets Gross ForeclosedAssetsGross	50919000	USD
CY2017Q4	wal	Foreclosed Assets Gross ForeclosedAssetsGross	32552000	USD
CY2018Q1	wal	Foreclosed Assets Gross ForeclosedAssetsGross	34244000	USD
CY2017Q1	wal	Gain Loss On Foreclosed Assets GainLossOnForeclosedAssets	-106000	USD
CY2018Q1	wal	Gain Loss On Foreclosed Assets GainLossOnForeclosedAssets	1242000	USD
CY2017Q1	wal	Gains Losses On Transfers To Other Real Estate And Foreclosed Assets GainsLossesOnTransfersToOtherRealEstateAndForeclosedAssets	0	USD
CY2018Q1	wal	Gains Losses On Transfers To Other Real Estate And Foreclosed Assets GainsLossesOnTransfersToOtherRealEstateAndForeclosedAssets	1000000	USD
CY2018Q1	wal	Legal Professional And Director Fees LegalProfessionalAndDirectorFees	6003000	USD
CY2017Q1	wal	Lendingrelatedfees Lendingrelatedfees	422000	USD
CY2018Q1	wal	Lendingrelatedfees Lendingrelatedfees	978000	USD
CY2017Q4	wal	Impaired Financing Receivable With No Related Allowance ImpairedFinancingReceivableWithNoRelatedAllowance	0	USD
CY2018Q1	wal	Impaired Financing Receivable With No Related Allowance ImpairedFinancingReceivableWithNoRelatedAllowance	0	USD
CY2017Q1	wal	Incomefrom Equity Investments IncomefromEquityInvestments	692000	USD
CY2018Q1	wal	Incomefrom Equity Investments IncomefromEquityInvestments	1460000	USD
CY2017Q4	wal	Interest Rateand Credit Markson Acquired Loans InterestRateandCreditMarksonAcquiredLoans	14100000	USD
CY2018Q1	wal	Interest Rateand Credit Markson Acquired Loans InterestRateandCreditMarksonAcquiredLoans	13000000	USD
CY2017Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	267023000	USD
CY2017Q4	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	267000000	USD
CY2018Q1	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	288900000	USD
CY2018Q1	wal	Investmentin Low Income Housing Tax Credit InvestmentinLowIncomeHousingTaxCredit	288911000	USD
CY2017Q1	wal	Legal Professional And Director Fees LegalProfessionalAndDirectorFees	8803000	USD
CY2017Q1	wal	Loan And Repossessed Asset Expense LoanAndRepossessedAssetExpense	1278000	USD
CY2018Q1	wal	Loan And Repossessed Asset Expense LoanAndRepossessedAssetExpense	583000	USD
CY2017Q1	wal	Loans And Loans Receivable Purchases LoansAndLoansReceivablePurchases	253300000	USD
CY2018Q1	wal	Loans And Loans Receivable Purchases LoansAndLoansReceivablePurchases	141500000	USD
CY2017Q4	wal	Loansand Leases Receivable Including Heldfor Sale Net LoansandLeasesReceivableIncludingHeldforSaleNet	14953900000	USD
CY2018Q1	wal	Loansand Leases Receivable Including Heldfor Sale Net LoansandLeasesReceivableIncludingHeldforSaleNet	15415700000	USD
CY2017Q4	wal	Loansand Leases Receivable Including Heldfor Sale Netof Deferred Income LoansandLeasesReceivableIncludingHeldforSaleNetofDeferredIncome	15093900000	USD
CY2018Q1	wal	Loansand Leases Receivable Including Heldfor Sale Netof Deferred Income LoansandLeasesReceivableIncludingHeldforSaleNetofDeferredIncome	15560400000	USD
CY2018Q1	wal	Maximum Loan To Value Ratio MaximumLoanToValueRatio	0.75
CY2017Q1	wal	Net Loss Gain On Sales Valuations Of Repossessed Assets And Bank Premises Net NetLossGainOnSalesValuationsOfRepossessedAssetsAndBankPremisesNet	-543000	USD
CY2018Q1	wal	Net Loss Gain On Sales Valuations Of Repossessed Assets And Bank Premises Net NetLossGainOnSalesValuationsOfRepossessedAssetsAndBankPremisesNet	-1228000	USD
CY2017Q1	wal	Non Interest Expense Deposit Costs NonInterestExpenseDepositCosts	1741000	USD
CY2018Q1	wal	Non Interest Expense Deposit Costs NonInterestExpenseDepositCosts	2926000	USD
CY2017Q4	wal	Non Performing Assets NonPerformingAssets	114939000	USD
CY2018Q1	wal	Non Performing Assets NonPerformingAssets	111294000	USD
CY2017Q4	wal	Non Performing Loans NonPerformingLoans	86399000	USD
CY2018Q1	wal	Non Performing Loans NonPerformingLoans	81100000	USD
CY2017Q4	wal	Number Of Securities In Unrealized Position NumberOfSecuritiesInUnrealizedPosition	302	positions
CY2018Q1	wal	Number Of Securities In Unrealized Position NumberOfSecuritiesInUnrealizedPosition	401	positions
CY2018Q1	wal	Number Of Unconsolidated Subsidiaries NumberOfUnconsolidatedSubsidiaries	8	Subsidiary
CY2018Q1	wal	Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries NumberOfWhollyOwnedSubsidiariesNonBankSubsidiaries	2	Subsidiary
CY2018Q1	wal	Numberof Statutory Business Trusts Formedor Acquired NumberofStatutoryBusinessTrustsFormedorAcquired	8	Trust
CY2017Q4	wal	Other Assets Segment OtherAssetsSegment	808900000	USD
CY2018Q1	wal	Other Assets Segment OtherAssetsSegment	840700000	USD
CY2017Q1	wal	Other Comprehensive Income Loss Unrealized Gain Losson Debt Carriedat Fair Value Tax OtherComprehensiveIncomeLossUnrealizedGainLossonDebtCarriedatFairValueTax	757000	USD
CY2018Q1	wal	Other Comprehensive Income Loss Unrealized Gain Losson Debt Carriedat Fair Value Tax OtherComprehensiveIncomeLossUnrealizedGainLossonDebtCarriedatFairValueTax	-478000	USD
CY2017Q1	wal	Other Comprehensive Income Loss Unrealized Gain Losson Junior Subordinated Debt Carriedat Fair Value OtherComprehensiveIncomeLossUnrealizedGainLossonJuniorSubordinatedDebtCarriedatFairValue	-1229000	USD
CY2018Q1	wal	Other Comprehensive Income Loss Unrealized Gain Losson Junior Subordinated Debt Carriedat Fair Value OtherComprehensiveIncomeLossUnrealizedGainLossonJuniorSubordinatedDebtCarriedatFairValue	1466000	USD
CY2017Q4	wal	Other Liabilities Segment OtherLiabilitiesSegment	360000000	USD
CY2018Q1	wal	Other Liabilities Segment OtherLiabilitiesSegment	448600000	USD
CY2017Q1	wal	Othernoninterestincome Othernoninterestincome	119000	USD
CY2018Q1	wal	Othernoninterestincome Othernoninterestincome	235000	USD
CY2017Q1	wal	Otherrevenue Otherrevenue	4202000	USD
CY2018Q1	wal	Otherrevenue Otherrevenue	3374000	USD
CY2017Q1	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	11700000	USD
CY2017Q4	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	25000000	USD
CY2018Q1	wal	Over Collateralization On Derivatives To Banks After Application Of Master Netting Agreements And Collateral OverCollateralizationOnDerivativesToBanksAfterApplicationOfMasterNettingAgreementsAndCollateral	12100000	USD
CY2017Q4	wal	Percentage Of Commercial Real Estate Loans Occupied By Owners PercentageOfCommercialRealEstateLoansOccupiedByOwners	0.36
CY2018Q1	wal	Percentage Of Commercial Real Estate Loans Occupied By Owners PercentageOfCommercialRealEstateLoansOccupiedByOwners	0.37
CY2017Q1	wal	Proceeds From Sale Of Other Real Estate Owned Gross ProceedsFromSaleOfOtherRealEstateOwnedGross	3113000	USD
CY2018Q1	wal	Proceeds From Sale Of Other Real Estate Owned Gross ProceedsFromSaleOfOtherRealEstateOwnedGross	5294000	USD
CY2017Q1	wal	Proceeds From Sale Of Other Real Estate Owned Net ProceedsFromSaleOfOtherRealEstateOwnedNet	2889000	USD
CY2018Q1	wal	Proceeds From Sale Of Other Real Estate Owned Net ProceedsFromSaleOfOtherRealEstateOwnedNet	5285000	USD
CY2017Q1	wal	Proceeds From Sale Of Other Real Estate Owned Valuation Allowance ProceedsFromSaleOfOtherRealEstateOwnedValuationAllowance	224000	USD
CY2018Q1	wal	Proceeds From Sale Of Other Real Estate Owned Valuation Allowance ProceedsFromSaleOfOtherRealEstateOwnedValuationAllowance	9000	USD
CY2017Q1	wal	Proceedsfrom Sale Paymentsto Purchase Investment In Money Market ProceedsfromSalePaymentstoPurchaseInvestmentInMoneyMarket	-90000	USD
CY2018Q1	wal	Proceedsfrom Sale Paymentsto Purchase Investment In Money Market ProceedsfromSalePaymentstoPurchaseInvestmentInMoneyMarket	-5000	USD
CY2017Q1	wal	Purchase Of Investment Tax Credits PurchaseOfInvestmentTaxCredits	3516000	USD
CY2018Q1	wal	Purchase Of Investment Tax Credits PurchaseOfInvestmentTaxCredits	13376000	USD
CY2017Q1	wal	Purchaseof Sbic Investments PurchaseofSBICInvestments	0	USD
CY2018Q1	wal	Purchaseof Sbic Investments PurchaseofSBICInvestments	263000	USD
CY2017Q4	wal	Qualifying Debt QualifyingDebt	376905000	USD
CY2018Q1	wal	Qualifying Debt QualifyingDebt	363935000	USD
CY2017Q1	wal	Restrictedstocksurrendered Restrictedstocksurrendered	10243000	USD
CY2018Q1	wal	Restrictedstocksurrendered Restrictedstocksurrendered	6296000	USD
CY2017Q1	wal	Success Fees SuccessFees	325000	USD
CY2018Q1	wal	Success Fees SuccessFees	781000	USD
CY2017Q4	wal	Troubled Debt Restructured Loans TroubledDebtRestructuredLoans	42431000	USD
CY2018Q1	wal	Troubled Debt Restructured Loans TroubledDebtRestructuredLoans	43766000	USD
CY2017Q1	wal	Unfunded Commitments To Purchase Investment Tax Credits UnfundedCommitmentsToPurchaseInvestmentTaxCredits	30869000	USD
CY2018Q1	wal	Unfunded Commitments To Purchase Investment Tax Credits UnfundedCommitmentsToPurchaseInvestmentTaxCredits	30000000	USD
CY2017Q4	wal	Unfunded Low Income Housing Tax Credit Obligations UnfundedLowIncomeHousingTaxCreditObligations	151300000	USD
CY2018Q1	wal	Unfunded Low Income Housing Tax Credit Obligations UnfundedLowIncomeHousingTaxCreditObligations	167900000	USD
CY2017Q1	wal	Valuation Adjustments Of Other Repossessed Assets Net ValuationAdjustmentsOfOtherRepossessedAssetsNet	380000	USD
CY2018Q1	wal	Valuation Adjustments Of Other Repossessed Assets Net ValuationAdjustmentsOfOtherRepossessedAssetsNet	-47000	USD
CY2017Q1	wal	Valuation Adjustments Of Other Repossessed Assets Valuation Allowance ValuationAdjustmentsOfOtherRepossessedAssetsValuationAllowance	-380000	USD
CY2018Q1	wal	Valuation Adjustments Of Other Repossessed Assets Valuation Allowance ValuationAdjustmentsOfOtherRepossessedAssetsValuationAllowance	47000	USD
CY2018Q1	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>
CY2018Q1	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

Name	View Source	Status
0001212545-18-000141-index-headers.html	Edgar Link	pending
0001212545-18-000141-index.html	Edgar Link	pending
0001212545-18-000141.txt	Edgar Link	pending
0001212545-18-000141-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
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R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
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R3.htm	Edgar Link	pending
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R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
wal-20180331.xml	Edgar Link	completed
wal-20180331.xsd	Edgar Link	pending
wal-20180331_cal.xml	Edgar Link	unprocessable
wal-20180331_def.xml	Edgar Link	unprocessable
wal-20180331_lab.xml	Edgar Link	unprocessable
wal-20180331_pre.xml	Edgar Link	unprocessable
wal331201810-q.htm	Edgar Link	pending
walex3113312018.htm	Edgar Link	pending
walex3123312018.htm	Edgar Link	pending
walex323312018.htm	Edgar Link	pending

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$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal

2018 Q1 Form 10-Q Financial Statement

#000121254518000141 Filed on April 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAL WESTERN ALLIANCE BANCORPORATION Stock $wal

2018 Q1 Form 10-Q Financial Statement

#000121254518000141 Filed on April 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAL
WESTERN ALLIANCE BANCORPORATION Stock $wal