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Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 003 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	06-0273620
Plan number	003
Participant loan, current value	$ 10,899,256
Total investments and notes receivable from participants	$ 1,279,391,238
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	3.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	9.50%
Investment, Identifier [Axis]: Common Collective Trusts | Eagle Mid Cap Growth CIT Founders Class
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	413,109
Current Value	$ 7,667,302
Investment, Identifier [Axis]: Common Collective Trusts | Fidelity Growth Company Commingled Pool Class A
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	2,235,897
Current Value	$ 198,301,702
Investment, Identifier [Axis]: Common Collective Trusts | Fidelity Managed Income Portfolio II Class 2
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	49,780,127
Current Value	$ 48,402,378
Investment, Identifier [Axis]: Common Collective Trusts | Fidelity Mid-Cap Stock Commingled Pool Class Z
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,167,316
Current Value	$ 32,264,603
Investment, Identifier [Axis]: Common Collective Trusts | JPMCB Core Plus Bond CF Class
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	2,681,194
Current Value	$ 33,032,306
Investment, Identifier [Axis]: Common Collective Trusts | Spartan 500 Index Pool Class C
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	432,308
Current Value	$ 140,439,701
Investment, Identifier [Axis]: Common Collective Trusts | Spartan Extended Market Index Pool Class C
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	78,568
Current Value	$ 14,952,975
Investment, Identifier [Axis]: Common Collective Trusts | Spartan International Index Pool Class C
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	46,911
Current Value	$ 8,354,926
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2020 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	309,791
Current Value	$ 16,301,183
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2025 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	919,613
Current Value	$ 52,123,650
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2030 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,375,419
Current Value	$ 81,713,630
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2035 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,204,940
Current Value	$ 76,489,572
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2040 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	831,909
Current Value	$ 57,202,038
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2045 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	745,347
Current Value	$ 54,060,051
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2050 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	756,773
Current Value	$ 56,644,446
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2055 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	306,358
Current Value	$ 30,715,454
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2060 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	200,562
Current Value	$ 15,872,507
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2065 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	106,795
Current Value	$ 5,203,039
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement 2070 Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	30,122
Current Value	$ 895,220
Investment, Identifier [Axis]: Common Collective Trusts | Vanguard Target Retirement Income Trust II
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	492,193
Current Value	$ 24,663,777
Investment, Identifier [Axis]: Registered Investment Companies | DFA U.S. Targeted Value Portfolio Institutional Class
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	275,606
Current Value	$ 10,191,915
Investment, Identifier [Axis]: Registered Investment Companies | Dodge & Cox International Stock Fund Class X
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	962,990
Current Value	$ 15,850,822
Investment, Identifier [Axis]: Registered Investment Companies | Dodge & Cox Stock Fund Class X
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	3,764,544
Current Value	$ 62,453,784
Investment, Identifier [Axis]: Registered Investment Companies | Fidelity Diversified International K6 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,723,638
Current Value	$ 30,542,864
Investment, Identifier [Axis]: Registered Investment Companies | Fidelity Government Money Market Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	251
Current Value	$ 251
Investment, Identifier [Axis]: Registered Investment Companies | Fidelity Investments Money Market Treasury Only Institutional Class
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	43,951,938
Current Value	$ 43,951,938
Investment, Identifier [Axis]: Registered Investment Companies | Invesco Discovery Fund Class R6
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	214,975
Current Value	$ 28,690,531
Investment, Identifier [Axis]: Registered Investment Companies | MFS Mid Cap Value Fund Class R6
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	330,313
Current Value	$ 10,322,271
Investment, Identifier [Axis]: Registered Investment Companies | Principal Real Estate Securities Fund Class R6
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	57,645
Current Value	$ 1,597,931
Investment, Identifier [Axis]: Registered Investment Companies | The Hartford World Bond Fund Class R6
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	312,228
Current Value	$ 3,125,402
Investment, Identifier [Axis]: Registered Investment Companies | Vanguard Total Bond Market Index Fund Institutional Shares
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,469,865
Current Value	$ 14,360,577
Registered investment companies
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	$ 221,088,286
Webster Financial Corporation common stock
EBP, Schedule of Asset Held for Investment [Line Items]
Investment, number of shares (in shares)	1,463,237	1,549,618
Current Value	$ 92,103,230
Interest-bearing cash
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	6
Common collective trusts
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	$ 955,300,460

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Amount of total assets in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, current value of investment, participant loan, and plan interest in master trust.

+ References

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Current value of investment, excluding plan interest in master trust, in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract.

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Amount, after deemed distribution, of participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

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Number of shares or units of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

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Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

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Plan number of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), in three-digit numeric format.

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