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Loans (Estimated Aggregate Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]        
Amortization Expense, Next Twelve Months $ 457wash_ServicingAssetExpectedAmortizationExpenseNextTwelveMonths      
Amortization Expense, Year Two 385wash_ServicingAssetExpectedAmortizationExpenseYearTwo      
Amortization Expense, Year Three 325wash_ServicingAssetExpectedAmortizationExpenseYearThree      
Amortization Expense, Year Four 274wash_ServicingAssetExpectedAmortizationExpenseYearFour      
Amortization Expense, Year Five 231wash_ServicingAssetExpectedAmortizationExpenseYearFive      
Amortization Expense, Thereafter 1,317wash_ServicingAssetExpectedAmortizationExpenseThereafter      
Total estimated amortization expense $ 2,989us-gaap_ServicingAssetAtAmortizedValue $ 2,767us-gaap_ServicingAssetAtAmortizedValue $ 1,275us-gaap_ServicingAssetAtAmortizedValue $ 937us-gaap_ServicingAssetAtAmortizedValue