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v3.25.4

Retirement Benefit Plans - Weighted Average Assumptions used to Determine Benefit Obligations (Details) | Dec. 31, 2025 | Dec. 31, 2024
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Pension | Webster Bank Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 5.26% | 5.43%
SERP | Webster Bank Supplemental Defined Benefit Plan for Executive Officers |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 5.00% | 5.31%
SERP | Astoria Bank Excess Benefit and Supplemental Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.67% | 5.14%
SERP | Astoria Bank Directors’ Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.49% | 5.04%
SERP | Eagle Benefit Equalization Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.88% |
SERP | Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.47% | 5.03%
SERP | Supplemental Executive Retirement Plan of Provident Bank |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.80% | 5.32%
SERP | Supplemental Executive Retirement Plan of Provident Bank - Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.41% | 5.09%
OPEB | Webster Bank Postretirement Medical Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.48% | 5.01%
OPEB | Sterling Bancorp Supplemental Postretirement Life Insurance Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 4.75% | 5.20%
OPEB | Astoria Bank Postretirement Welfare Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount Rate | 5.18% | 5.39%

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