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Regulatory Matters (Information On The Capital Ratios) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash Dividends Paid to Parent Company $ 100,000,000us-gaap_CashDividendsPaidToParentCompany $ 90,000,000us-gaap_CashDividendsPaidToParentCompany
Cash Reserve Deposited at Federal Reserve Bank 38,300,000wbs_CashReserveDepositedAtFederalReserveBank 41,800,000wbs_CashReserveDepositedAtFederalReserveBank
Total risk-based capital, Actual Amount 2,096,772,000us-gaap_Capital 1,965,171,000us-gaap_Capital
Total risk-based capital, Actual Ratio 14.10%us-gaap_CapitalToRiskWeightedAssets 14.20%us-gaap_CapitalToRiskWeightedAssets
Total risk-based capital, Minimum Amount 1,192,651,000us-gaap_CapitalRequiredForCapitalAdequacy 1,106,203,000us-gaap_CapitalRequiredForCapitalAdequacy
Total risk-based capital, Capital Requirements Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Total risk-based capital, Well Capitalized Amount 1,490,706,000us-gaap_CapitalRequiredToBeWellCapitalized 1,382,754,000us-gaap_CapitalRequiredToBeWellCapitalized
Total risk-based capital, Well Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 capital, Actual Amount 1,931,276,000us-gaap_TierOneRiskBasedCapital 1,807,642,000us-gaap_TierOneRiskBasedCapital
Tier 1 capital, Actual Ratio 13.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 13.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier 1 capital, Minimum Amount 596,326,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 553,101,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier 1 capital, Capital Requirements Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 capital, Well Capitalized Amount 894,423,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized 829,652,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Tier 1 capital, Well Capitalized Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 leverage capital ratio, Actual Amount 1,931,276,000us-gaap_TierOneLeverageCapital 1,807,642,000us-gaap_TierOneLeverageCapital
Tier 1 leverage capital ratio, Actual Ratio 9.00%us-gaap_TierOneLeverageCapitalToAverageAssets 9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier 1 leverage capital ratio, Minimum Amount 859,241,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 801,535,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier 1 leverage capital ratio, Capital Requirements Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Tier 1 leverage capital ratio, Well Capitalized Amount 1,074,051,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized 1,001,919,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Tier 1 leverage capital ratio, Well Capitalized Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Trust Preferred Securities Included in Tier One Capital 75,000,000wbs_TrustPreferredSecuritiesIncludedInTierOneCapital 75,000,000wbs_TrustPreferredSecuritiesIncludedInTierOneCapital
Webster Bank N.A. [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital, Actual Amount 1,939,229,000us-gaap_Capital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 1,815,423,000us-gaap_Capital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Total risk-based capital, Actual Ratio 13.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 13.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Total risk-based capital, Minimum Amount 1,190,242,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 1,104,200,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Total risk-based capital, Capital Requirements Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Total risk-based capital, Well Capitalized Amount 1,487,803,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 1,380,250,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Total risk-based capital, Well Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Actual Amount 1,774,814,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 1,658,466,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Actual Ratio 11.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 12.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Minimum Amount 595,121,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 552,100,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Capital Requirements Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Well Capitalized Amount 892,682,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 828,150,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 capital, Well Capitalized Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Actual Amount 1,774,814,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 1,658,466,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Actual Ratio 8.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 8.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Minimum Amount 858,197,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 800,063,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Capital Requirements Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Well Capitalized Amount $ 1,072,746,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 $ 1,000,079,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember
Tier 1 leverage capital ratio, Well Capitalized Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= wbs_WebsterBankNAMember