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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table summarizes the changes in the benefit obligation, fair value of plan assets, and funded status of the defined benefit pension and other postretirement benefit plans at December 31:
  
PensionSERPOPEB
(In thousands)202520242025202420252024
Change in benefit obligation:
Beginning balance$174,112 $189,986 $3,598 $4,139 $13,667 $22,669 
Benefit obligation (1)
— — 106 — — — 
Service cost— — — — 19 17 
Interest cost8,775 8,648 172 178 692 956 
Actuarial loss (gain) (2)
4,269 (13,588)241 (260)(88)3,637 
Benefits paid(11,466)(10,934)(449)(459)(741)(13,612)
Ending balance175,690 174,112 3,668 3,598 13,549 13,667 
Change in plan assets:
Beginning balance209,339 217,167 — — — — 
Actual return on plan assets (3)
23,194 3,106 — — — — 
Employer contributions— — 449 459 741 13,612 
Benefits paid(11,466)(10,934)(449)(459)(741)(13,612)
Ending balance221,067 209,339 — — — — 
Funded status (4)
$45,377 $35,227 $(3,668)$(3,598)$(13,549)$(13,667)
(1)Reflects the benefit obligation as of the date that the Eagle Benefit Equalization Plan was integrated into the Company’s consolidated financial statements in 2025.
(2)The change in actuarial (gain) loss is primarily due to actuarial losses in 2025 resulting from a decrease in discount rates, as compared to actuarial (gains) in 2024 resulting from an increase in discount rates.
(3)The increase in the actual return on plan assets for the Pension Plan is primarily due to the performance of fixed income investments, which comprise approximately 65% of the portfolio. In 2025, fixed income investments earned a positive return, as compared to a negative return in 2024.
(4)The overfunded (underfunded) status of each plan is respectively included in Accrued interest receivable and other assets or Accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets, as applicable.
The following table sets forth by level within the fair value hierarchy the Pension Plan’s assets at fair value:
December 31,
  
20252024
(In thousands)Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Common collective trusts$— $198,764 $— $198,764 $— $188,399 $— $188,399 
Registered investment companies22,303 — — 22,303 20,940 — — 20,940 
Total pension plan assets$22,303 $198,764 $— $221,067 $20,940 $188,399 $— $209,339 
Schedule of Assumptions Used
The following table summarizes the weighted-average assumptions used to determine the benefit obligation at December 31:
  
Discount Rate
  
20252024
Pension:
Webster Bank Pension Plan5.26 %5.43 %
SERP:
Webster Bank Supplemental Defined Benefit Plan for Executive Officers5.00 %5.31 %
Astoria Bank Excess Benefit and Supplemental Benefit Plans4.67 5.14 
Astoria Bank Directors’ Retirement Plan
4.49 5.04 
Eagle Benefit Equalization Plan4.88 n/a
Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors4.47 5.03 
Supplemental Executive Retirement Plan of Provident Bank4.80 5.32 
Supplemental Executive Retirement Plan of Provident Bank - Other4.41 5.09 
OPEB:
Webster Bank Postretirement Medical Benefit Plan4.48 %5.01 %
Sterling Bancorp Supplemental Postretirement Life Insurance Plan4.75 5.20 
Astoria Bank Postretirement Welfare Benefit Plans5.18 5.39 
The following table summarizes the weighted-average assumptions used to determine net periodic benefit (income) cost for the years ended December 31:
  Discount Rate
  202520242023
Pension:
Webster Bank Pension Plan5.43 %4.76 %4.96 %
SERP:
Webster Bank Supplemental Defined Benefit Plan for Executive Officers5.31 %4.68 %4.88 %
Astoria Bank Excess Benefit and Supplemental Benefit Plans5.14 4.56 4.77 
Astoria Bank Directors’ Retirement Plan
5.04 4.50 4.70 
Eagle Benefit Equalization Plan5.06 n/an/a
Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors5.03 4.50 4.70 
Supplemental Executive Retirement Plan of Provident Bank5.32 4.83 5.04 
Supplemental Executive Retirement Plan of Provident Bank - Other5.09 4.71 4.90 
OPEB:
Webster Bank Postretirement Medical Benefit Plan5.01 %4.54 %4.72 %
Sterling Bancorp Supplemental Postretirement Life Insurance Plan5.20 4.51 4.70 
Astoria Bank Postretirement Welfare Benefit Plans5.39 4.74 4.94 
Split Dollar Life Insurance Arrangementn/a4.45 4.63 
Expected Long-Term Rate of Return on Plan Assets
202520242023
Pension:
Webster Bank Pension Plan6.00 %6.00 %6.00 %
Assumed Health Care Cost Trend Rate (1)
202520242023
OPEB:
Webster Bank Postretirement Medical Benefit Plan7.00 %6.50 %6.50 %
Astoria Bank Postretirement Welfare Benefit Plans7.00 6.50 6.40 
(1)The rates to which the healthcare cost trend rates are assumed to decline (ultimate trend rates) along with the year that the ultimate trend rates will be reached are 4.40% in 2036 for the Webster Bank Postretirement Medical Benefit Plan and 4.40% in 2036 for the Astoria Bank Postretirement Welfare Benefit Plans.
Schedule of Net Periodic Benefit Cost Not yet Recognized
The following table summarizes the amounts recorded in accumulated other comprehensive (loss) that have not yet been recognized in net periodic benefit (income) cost at December 31:
  
PensionSERPOPEB
(In thousands)202520242025202420252024
Transition obligation$— $— $104 $— $— $— 
Net actuarial loss (gain)25,686 34,440 207 (44)(1,613)(1,788)
Deferred tax (benefit) expense(4,120)(6,488)(50)8 258 337 
Net amount recorded in (AOCL)$21,566 $27,952 $261 $(36)$(1,355)$(1,451)
Summary of Net Periodic Benefit Cost
The following table summarizes the components of net periodic benefit (income) cost for the years ended December 31:
PensionSERPOPEB
(In thousands)202520242023202520242023202520242023
Service cost $— $— $— $— $— $— $19 $17 $27 
Interest cost8,775 8,648 8,782 172 178 191 692 956 1,042 
Expected return on plan assets(12,231)(12,709)(11,778)— — — — — — 
Amortization of transition obligation— — — (2)— — — — — 
Amortization of actuarial loss (gain)2,061 2,871 4,781 (11)12 6 (528)(976)(2,704)
Other (1)
——— ——— — 3,212 — 
Net periodic benefit (income) cost (2)
$(1,395)$(1,190)$1,785 $159 $190 $197 $183 $3,209 $(1,635)
(1)Reflects the loss recognized upon cessation of the Split Dollar Life Insurance Arrangement in 2024.
(2)Net periodic benefit (income) cost is included in Other expense on the accompanying Consolidated Statements of Income.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The following table summarizes amounts recognized in other comprehensive income (loss), including reclassification adjustments, for the years ended December 31:
PensionSERPOPEB
(In thousands)202520242023202520242023202520242023
Net actuarial (gain) loss$(6,693)$(3,985)$(10,639)$241 $(260)$183 $(251)$955 $(382)
Amortization of transition obligation— — — 2 — — — — — 
Amortization of actuarial (loss) gain(2,061)(2,871)(4,781)11 (12)(6)528 976 2,704 
Total (gain) loss recognized in
OCI (OCL)		$(8,754)$(6,856)$(15,420)$254 $(272)$177 $277 $1,931 $2,322 
Schedule of Expected Benefit Payments
At December 31, 2025, the expected future benefit payments for the Company’s defined benefit pension and other postretirement benefits plans are as follows:
(In thousands)PensionSERPOPEB
2026$11,383 $471 $1,195 
202711,890 451 1,219 
202812,287 428 1,185 
202912,580 404 1,153 
203012,801 377 1,108 
Thereafter65,432 1,463 5,078 
Schedule of Multiemployer Plans
The following table summarizes information related to the Bank’s participation in the multi-employer plan:
(Dollars in thousands)Contributions
Years Ended December 31,		Funded Status
At December 31,
Plan NameEmployer Identification NumberPlan NumberSurcharge Imposed20252024202320252024
Pentegra Defined Benefit Plan
for Financial Institutions		13-5645888333No$475$482$448At least 80 percentAt least 80 percent