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Fair Value Measurements (Details) - EBP 003 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value $ 1,268,491,982 $ 1,115,165,345
Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 221,088,286 198,055,728
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 177,136,097 160,328,568
Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 43,952,189 37,727,160
Webster Financial Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 92,103,230 85,576,606
Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 6 6
Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 955,300,460 831,533,005
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 313,191,522 283,632,340
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 177,136,097 160,328,568
Level 1 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 43,952,189 37,727,160
Level 1 | Webster Financial Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 92,103,230 85,576,606
Level 1 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 6 6
Level 1 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 955,300,460 831,533,005
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Webster Financial Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 955,300,460 831,533,005
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 3 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 3 | Webster Financial Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 3 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 3 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value $ 0 $ 0