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Retirement Benefit Plans
 9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Retirement Benefit Plans Retirement Benefit Plans
Defined Benefit Pension and Other Postretirement Benefits
The following tables summarize the components of net periodic benefit (income) cost:
Three months ended September 30,
20222021
(In thousands)Pension PlanSERPOPEBPension PlanSERPOPEB
Service cost$— $— $9 $— $— $— 
Interest cost1,441 17 194 1,166 7 4 
Expected return on plan assets(3,669)— — (3,595)— — 
Amortization of actuarial loss (gain)821 7 7 1,019 8 (20)
Net periodic benefit (income) cost$(1,407)$24 $210 $(1,410)$15 $(16)
Nine months ended September 30,
20222021
(In thousands)Pension PlanSERPOther BenefitsPension PlanSERPOther Benefits
Service cost$— $— $24 $— $— $— 
Interest cost4,198 49 551 3,498 20 12 
Expected return on plan assets(11,006)— — (10,786)— — 
Amortization of actuarial loss (gain)1,667 20 (30)3,058 25 (60)
Net periodic benefit (income) cost$(5,141)$69 $545 $(4,230)$45 $(48)
The components of net periodic benefit (income) cost are included within other non-interest expense on the accompanying Condensed Consolidated Statements of Income. The weighted-average expected long-term rate of return on plan assets for the nine months ended September 30, 2022 was 5.50%, as determined at the beginning of the year.
In connection with the Sterling merger, Webster assumed the benefit obligations of Sterling's pension and other postretirement benefit plans, which included the Astoria Excess and Supplemental Benefit Plans, Astoria Directors' Retirement Plan, Greater New York Savings Bank Directors' Retirement Plan, Astoria Bank Retiree Health Care Plan, and the Sterling Other Postretirement Life Insurance and Other Plans, totaling $30.5 million as of January 31, 2022. The underfunded status of these plans is included in accrued expenses and other current liabilities on the Condensed Consolidated Balance Sheets.