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Loans (Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2013
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 16us-gaap_FinancingReceivableModificationsNumberOfContracts2 15us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Recorded Investment $ 2,183us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [1] $ 17,834us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 [1]
Post-Modification Recorded Investment 2,183us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 [1] 16,645us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 [1]
Commercial Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 [1] 15,974us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 [1]
Post-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 [1] 14,785us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 [1]
Commercial Construction and Development [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 [1] 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 [1]
Post-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 [1] 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 [1]
Commercial and Industrial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 12us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember		 7us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember
Pre-Modification Recorded Investment 1,191us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember		 [1] 1,198us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember		 [1]
Post-Modification Recorded Investment 1,191us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember		 [1] 1,198us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_CommercialOtherMember		 [1]
Residential Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember		 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember
Pre-Modification Recorded Investment 992us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember		 [1] 570us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember		 [1]
Post-Modification Recorded Investment 992us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember		 [1] 570us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialMortgageMember		 [1]
Homeowner Construction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember		 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember		 [1] 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember		 [1]
Post-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember		 [1] 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeownerConstructionMember		 [1]
Home Equity Lines [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember		 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember		 [1] 92us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember		 [1]
Post-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember		 [1] 92us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember		 [1]
Home Equity Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember		 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember		 [1] 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember		 [1]
Post-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember		 [1] 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_HomeEquityLoansMember		 [1]
Other Consumer [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans Modified as a Troubled Debt Restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember		 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember
Pre-Modification Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember		 [1] 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember		 [1]
Post-Modification Recorded Investment $ 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember		 [1] $ 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= wash_OtherConsumerMember		 [1]
[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. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.