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Loans (Troubled Debt Restructurings Type of Modification) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment $ 428us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [1] $ 479us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [1]
Below market interest rate concession [Member]    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment 335us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_BelowmarketinterestrateconcessionMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_BelowmarketinterestrateconcessionMember
Payment deferral [Member]    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment 93us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_PaymentdeferralMember
479us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_PaymentdeferralMember
Maturity / amortization concession [Member]    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_MaturityamortizationconcessionMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_MaturityamortizationconcessionMember
Interest only payments [Member]    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_InterestonlypaymentsMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_InterestonlypaymentsMember
Combination of concessions [Member]    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Recorded Investment $ 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CombinationofconcessionsMember
[2] $ 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CombinationofconcessionsMember
[2]
[1] The recorded investment in troubled debt restructurings consists of unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs, at the time of the restructuring. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.
[2] Loans included in this classification were modified with a combination of any two of the concessions listed in this table.