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Fair Value Measurements (Narrative) (Details) (Nonrecurring [Member], Level 3 [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Nonrecurring [Member] | Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Allowance For Loan Loss Allocation on Collateral Dependent Impaired Loans $ 1.2wash_AllowanceForLoanLossAllocationOnCollateralDependentImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 $ 1.3wash_AllowanceForLoanLossAllocationOnCollateralDependentImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember