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Loans (Nonaccrual Loans) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans $ 15,865,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 15,945,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Accruing loans 90 days or more past due 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Current Payment Status [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Receivable, Nonaccrual of Interest, Current 3,600,000wash_LoansReceivableNonaccrualOfInterestCurrent
/ wash_NonaccrualLoansCurrentPaymentStatusAxis
= wash_CurrentPaymentStatusMember
3,200,000wash_LoansReceivableNonaccrualOfInterestCurrent
/ wash_NonaccrualLoansCurrentPaymentStatusAxis
= wash_CurrentPaymentStatusMember
Commercial Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 5,115,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
5,315,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Commercial Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 2,193,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
1,969,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 6,956,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
7,124,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Homeowner Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_HomeownerConstructionMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_HomeownerConstructionMember
Home Equity Lines [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 1,051,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
1,217,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Home Equity Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 511,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_HomeEquityLoansMember
317,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_HomeEquityLoansMember
Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans $ 39,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_OtherConsumerMember
$ 3,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_OtherConsumerMember