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Derivative Financial Instruments (Schedule of forward-settle interest rate swaps) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Total Notional Amount $ 8,118,631invest_DerivativeNotionalAmount $ 13,138,667invest_DerivativeNotionalAmount
Forward Contracts [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Matures November 2019 [Member]    
Derivative [Line Items]    
Number of Instruments 2us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesNovember182019MemberDomain
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Total Notional Amount 50,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesNovember182019MemberDomain
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Forward Contracts [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Matures January 2020 [Member]    
Derivative [Line Items]    
Number of Instruments 2us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesJanuary312020Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Total Notional Amount 50,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesJanuary312020Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Forward Contracts [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Matures June 2020 [Member]    
Derivative [Line Items]    
Number of Instruments 2us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesJuly2020MemberDomain
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Total Notional Amount $ 50,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= wbs_MaturesJuly2020MemberDomain
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember