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Retirement Benefit Plans - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Jul. 01, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected long-term rate of return | 6.00% |  |  |
Shortfall amortization period | 15 years |  |  |
Funded status of plan |  |  |  | $ (2.8)
Sterling National Bank 401k And Profit Sharing Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution, percent of match |  |  | 50.00% |
Maximum employee contributions of eligible compensation |  |  | 4.00% |
Maximum match |  |  | 2.00% |
Profit sharing contribution |  |  | 3.00% |
Compensation expense | $ 23.4 | $ 20.6 | $ 20.3 |
Webster Bank Retirement Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution, percent of match | 100.00% | 100.00% | 100.00% |
Employer matching contribution, percent of employees' gross pay | 2.00% | 2.00% | 2.00% |
Employer matching contribution, additional percent of match | 50.00% | 50.00% | 50.00% |
Employer additional matching contribution, percent of employees' gross pay | 6.00% | 6.00% | 6.00% |
Fixed Income Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation percentage | 64.50% |  |  |
Actual asset allocation percentages | 64.10% |  |  |
Equity Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation percentage | 35.50% |  |  |
Actual asset allocation percentages | 35.30% |  |  |
Cash and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual asset allocation percentages | 0.60% |  |  |

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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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