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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net periodic (income) benefit cost for the Pension Plan, RIM Plan, Post-retirement Plan and Split-Dollar Life Insurance plan benefits for the three and six months ended June 30, 2024 and 2023, includes the following components:

 For the Three Months Ended June 30,
Pension Plan(1)
RIM PlanPost-retirement PlanSplit-Dollar Life Insurance
20242023202420232024202320242023 Affected Line Item in the Consolidated Statements of Income
(In thousands)
Service cost$1,212 $1,199 $61 $69 $54 $54 $57 $69 Compensation and employee benefits
Interest cost3,100 2,790 162 158 248 242 208 204 Other non-interest expense
Expected return on plan assets(8,119)(7,480)— — — — — — Other non-interest expense
Amortization:
Prior service cost— — — — — — 14 14 Other non-interest expense
Net loss512 — 28 14 — — — — Other non-interest expense
Net periodic (income) benefit cost$(3,295)$(3,491)$251 $241 $302 $296 $279 $287 
(1) Effective September 30, 2023, the RSI Pension Plan was merged into the Columbia Bank Pension Plan.
13.    Components of Net Periodic Benefit Cost (continued)

For the Six Months Ended June 30,
Pension Plan(1)
RIM PlanPost-retirement PlanSplit-Dollar Life Insurance
20242023202420232024202320242023 Affected Line Item in the Consolidated Statements of Income
(In thousands)
Service cost$2,424 $2,398 $122 $138 $108 $108 $114 $139 Compensation and employee benefits
Interest cost6,200 5,581 324 316 496 485 416 409 Other non-interest expense
Expected return on plan assets(16,239)(14,960)— — — — — — Other non-interest expense
Amortization:
Prior service cost— — — — — — 28 28 Other non-interest expense
Net loss1,024 — 56 28 — — — — Other non-interest expense
Net periodic (income) benefit cost$(6,591)$(6,981)$502 $482 $604 $593 $558 $576 
(1) Effective September 30, 2023, the RSI Pension Plan was merged into the Columbia Bank Pension Plan.
Net periodic (income) benefit cost for the Pension Plan and Post-retirement Plan for the three and six months ended June 30, 2024 and 2023, includes the following components:

 For the Three Months Ended June 30,
Pension Plan(1)
Post-retirement PlanAffected Line Item in the Consolidated Statements of Income
2024202320242023
(In thousands)
Service cost$— $— $13 $17 Compensation and employee benefits
Interest cost— 76 31 27 Other non-interest expense
Expected return on plan assets— (122)— — Other non-interest expense
Amortization:
Net (gain)— — (5)(15)Other non-interest expense
Net periodic (income) benefit cost $— $(46)$39 $29 
(1) Effective September 30, 2023, the RSI Pension Plan was merged into the Columbia Bank Pension Plan.

For the Six Months Ended June 30,
Pension Plan (1)
Post-retirement PlanAffected Line Item in the Consolidated Statements of Income
2024202320242023
(In thousands)
Service cost$— $— $26 $34 Compensation and employee benefits
Interest cost— 152 62 53 Other non-interest expense
Expected return on plan assets— (243)— — Other non-interest expense
Amortization:
Net (gain)— — (10)(30)Other non-interest expense
Net periodic (income) benefit cost $— $(91)$78 $57 
(1) Effective September 30, 2023, the RSI Pension Plan was merged into the Columbia Bank Pension Plan.