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Loans (Troubled Debt Restructurings Type of Modification) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Below Market Interest Rate Concession $ 77wash_BelowMarketInterestRateConcession $ 15,836wash_BelowMarketInterestRateConcession
Payment Deferral 791wash_PaymentDeferral 570wash_PaymentDeferral
Maturity and Amortization Concession 964wash_MaturityAndAmortizationConcession 21wash_MaturityAndAmortizationConcession
Interest Only Payments 0wash_InterestOnlyPayments 424wash_InterestOnlyPayments
Combination 351wash_Combination [1] 983wash_Combination [1]
Pre-Modification Recorded Investment $ 2,183us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [2] $ 17,834us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [2]
[1] Loans included in this classification were modified with a combination of any two of the concessions listed in this table.
[2] The recorded investment in troubled debt restructurings consists of unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.