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Components of Net Periodic Benefit Cost | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost The Bank has a noncontributory defined benefit pension plan covering its full-time employees who had attained age 21 with at least one year of service as of April 1, 2003. The pension plan was frozen on April 1, 2003. All participants in the Plan are 100% vested. The pension plan’s assets are invested in investment funds and group annuity contracts currently managed by the Principal Financial Group and Allmerica Financial. In addition to pension benefits, certain health care and life insurance benefits are currently made available to certain of the Bank’s retired employees. The costs of such benefits are accrued based on actuarial assumptions from the date of hire to the date the employee is fully eligible to receive the benefits. Effective January 1, 2003, eligibility for retiree health care benefits was frozen as to new entrants, and benefits were eliminated for employees with less than ten years of service as of December 31, 2002. Effective January 1, 2007, eligibility for retiree life insurance benefits was frozen as to new entrants and retiree life insurance benefits were eliminated for employees with less than ten years of service as of December 31, 2006. Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three and six months ended June 30, 2023 and 2022 includes the following components (in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | Pension benefits |  | Other post-retirement benefits |  | Pension benefits |  | Other post-retirement benefits
|  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost |  | $ | — |  |  | — |  |  | 3 |  |  | 7 |  |  | $ | — |  |  | — |  |  | 6 |  |  | 14 |
Interest cost |  | 302 |  |  | 214 |  |  | 150 |  |  | 111 |  |  | 604 |  |  | 428 |  |  | 300 |  |  | 222 |
Expected return on plan assets |  | (706) |  |  | (864) |  |  | — |  |  | — |  |  | (1,412) |  |  | (1,728) |  |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of the net loss (gain) |  | 177 |  |  | — |  |  | (533) |  |  | (326) |  |  | 354 |  |  | — |  |  | (1,066) |  |  | (652) |
Net periodic (decrease) increase in benefit cost |  | $ | (227) |  |  | (650) |  |  | (380) |  |  | (208) |  |  | $ | (454) |  |  | (1,300) |  |  | (760) |  |  | (416) |
In its consolidated financial statements for the year ended December 31, 2022, the Company previously disclosed that it does not expect to contribute to the pension plan in 2023. As of June 30, 2023, no contributions have been made to the pension plan. The changes in net periodic benefit cost for pension benefits and other post-retirement benefits for the three and six months ended June 30, 2023 were calculated using the January 1, 2023 pension and other post-retirement benefits actuarial valuations.

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