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Retirement Benefit Plans - Weighted Average Assumptions used to Determine Benefit Obligations (Details)
Dec. 31, 2025
Dec. 31, 2024
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%