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Loans (Credit Quality Indicators - Commercial) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable $ 1,491,655us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 $ 1,301,089us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 819,857us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 756,838us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Construction and Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 79,592us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 36,289us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 592,206us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 507,962us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 34,683us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 43,072us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 18,372us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 23,185us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Construction and Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 16,311us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 19,887us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 9,150us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember		 19,174us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember
Classified [Member] | Commercial Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 5,749us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember		 16,226us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember
Classified [Member] | Commercial Construction and Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember
Classified [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable $ 3,401us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember		 $ 2,948us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wash_CommercialOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= wash_ClassifiedMember