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Components of Net Periodic Benefit Costs
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Components of Periodic Benefit Costs Components of Net Periodic Benefit Cost
    Pension Plan, Retirement Income Maintenance Plan (the "RIM Plan") and Post-retirement Plan

    The Company maintains a single employer, tax-qualified defined benefit pension plan (the "Pension Plan") which covers full-time employees that satisfy the Pension Plan's eligibility requirements. The benefits are based on years of service and the employee's average compensation for the highest five consecutive years of employment. Effective October 1, 2018, employees hired by the Bank are not eligible to participate in the Bank's Pension Plan as the plan has been closed to new employees as of that date.
    
    The Company also has a Retirement Income Maintenance Plan (the "RIM "Plan) which is a non-qualified defined benefit plan which provides benefits to all employees of the Company if their benefits under the Pension Plan are limited by Internal Revenue Code 415 and 401(a)(17).    

    In addition, the Company provides certain health care and life insurance benefits to eligible retired employees under a Post-retirement Plan. The Company accrues the cost of retiree health care and other benefits during the employees’ period of active service. Effective January 1, 2019, the Post-retirement Plan has been closed to new hires. The Company also provides life insurance benefits to eligible employees under an endorsement split-dollar life insurance program.

    Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and split-dollar life insurance arrangement plan benefits for the three and nine months ended September 30, 2020 and 2019, includes the following components:
13.    Components of Net Periodic Benefit Cost (continued)

For the Three Months Ended September 30,
Pension PlanRIM PlanPost-retirement PlanSplit-Dollar Life Insurance
20202019202020192020201920202019 Affected Line Item in the Consolidated Statements of Income
(In thousands)
Service cost$2,032 $1,746 $67 $53 $99 $84 $120 $88 Compensation and employee benefits
Interest cost1,824 2,090 102 116 171 207 135 114 Other non-interest expense
Expected return on plan assets(5,908)(5,802)— — — — — — Other non-interest expense
Amortization:
Prior service cost— — — — — — 14 14 Other non-interest expense
Net loss1,492 770 99 61 77 37 113 62 Other non-interest expense
Net periodic (income) benefit cost$(560)$(1,196)$268 $230 $347 $328 $382 $278 

For the Nine Months Ended September 30,
Pension PlanRIM PlanPost-retirement PlanSplit-Dollar Life Insurance
20202019202020192020201920202019 Affected Line Item in the Consolidated Statements of Income
(In thousands)
Service cost$5,906 $4,748 $201 $159 $297 $252 $346 $264 Compensation and employee benefits
Interest cost5,887 6,478 306 348 513 621 384 342 Other non-interest expense
Expected return on plan assets(17,383)(15,256)— — — — — — Other non-interest expense
Amortization:
Prior service cost— — — — — — 42 42 Other non-interest expense
Net loss3,054 2,300 297 183 231 111 339 186 Other non-interest expense
Net periodic (income) benefit cost$(2,536)$(1,730)$804 $690 $1,041 $984 $1,111 $834 

    For the three and nine months ended September 30, 2020, a $12.0 million contribution was made to the Pension Plan. The net periodic cost (income) for pension benefits, other post-retirement and split dollar life insurance benefits for the three and nine months ended September 30, 2020 were calculated using the most recent available benefit valuations.
    
    Through the acquisition of the Roselle entities, the Company acquired a non-contributory defined benefit supplemental executive retirement plan with the only participant being a former president of Roselle Bank. For the three and nine months ended September 30, 2020 the Company recorded a net periodic benefit cost of $4,000 and $8,000, respectively, in connection with this plan.