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Retirement Benefit Plans - Weighted Average Assumptions used to Determine Benefit Obligations (Details)
Dec. 31, 2024
Dec. 31, 2023
Pension | Webster Bank Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.43% 4.76%
SERP | Webster Bank Supplemental Defined Benefit Plan for Executive Officers    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.31% 4.68%
SERP | Astoria Bank Excess Benefit and Supplemental Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.14% 4.56%
SERP | Astoria Bank Directors’ Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.04% 4.50%
SERP | Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.03% 4.50%
SERP | Supplemental Executive Retirement Plan of Provident Bank    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.32% 4.83%
SERP | Supplemental Executive Retirement Plan of Provident Bank - Other    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.09% 4.71%
OPEB | Webster Bank Postretirement Medical Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.01% 4.54%
OPEB | Sterling Bancorp Supplemental Postretirement Life Insurance Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.20% 4.51%
OPEB | Astoria Bank Postretirement Welfare Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.39% 4.74%
OPEB | Split Dollar Life Insurance Arrangement    
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate   4.45%