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Fair Value Measurements (Narrative) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale, amortized cost $ 29,500,000us-gaap_LoansReceivableHeldForSaleAmount $ 11,500,000us-gaap_LoansReceivableHeldForSaleAmount
Mortgage loans held for sale, fair value 30,321,000us-gaap_LoansHeldForSaleFairValueDisclosure 11,636,000us-gaap_LoansHeldForSaleFairValueDisclosure
Mortgage loans held for sale difference between fair value and principal amount 779,000wash_MortgageLoansHeldForSaleDifferenceBetweenFairValueAndPrincipalAmount 181,000wash_MortgageLoansHeldForSaleDifferenceBetweenFairValueAndPrincipalAmount
Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Allowance for loan loss on collateral dependent impaired loans $ 1,300,000wash_AllowanceForLoanLossAllocationOnCollateralDependentImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 $ 453,000wash_AllowanceForLoanLossAllocationOnCollateralDependentImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember