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v3.23.1

Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Postretirement Benefit Plans | Postretirement Benefit Plans Mid Penn has an unfunded noncontributory defined benefit retirement plan for directors, which provides defined benefits based on the respective director’s years of service, as well as a postretirement healthcare and life insurance benefit plan, which is noncontributory, covering certain full-time employees. Mid Penn also assumed noncontributory defined benefit pension plans as a result of the acquisitions of Scottdale on January 8, 2018 and Riverview on November 30, 2021. These healthcare and life insurance plans are noncontributory and each plan uses a December 31 measurement date. The components of net periodic benefit costs from these defined benefit plans are as follows:
| Three Months Ended March 31,
| Pension Benefits |  | Other Benefits
(In thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 36 |  |  | $ | 42 |  |  | $ | 1 |  |  | $ | 4 |
Interest cost | 142 |  |  | 46 |  |  | 3 |  |  | 17 |
Expected return on plan assets | (149) |  |  | (59) |  |  | — |  |  | — |
Accretion of prior service cost | — |  |  | — |  |  | (2) |  |  | (5) |
Amortization of net (gain) loss | (5) |  |  | (2) |  |  | — |  |  | 4 |
Net periodic benefit expense | $ | 24 |  |  | $ | 27 |  |  | $ | 2 |  |  | $ | 20 |
Service costs are reported as a component of salaries and employee benefits on the Consolidated Statement of Income, while interest costs, expected return on plan assets and amortization (accretion) of prior service cost are reported as a component of other income.

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