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Components of Net Periodic Benefit Cost | 6 Months Ended
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Jun. 30, 2023
Components of Net Periodic Benefit Cost |
Components of Net Periodic Benefit Cost | 7. Components of Net Periodic Benefit Cost ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement
​ | ​ | Pension Benefits | ​ | Health Benefits | ​ | Pension Benefits | ​ | Health Benefits
(Dollar amounts in thousands) |  | 2023 |  | 2022 | ​ | 2023 |  | 2022 | ​ | 2023 |  | 2022 | ​ | 2023 |  | 2022
Service cost | ​ | $ | 157 | ​ | $ | 298 | ​ | $ | 5 | ​ | $ | 9 | ​ | $ | 314 | ​ | $ | 595 | ​ | $ | 10 | ​ | $ | 17
Interest cost | ​ |  | 956 | ​ |  | 707 | ​ |  | 39 | ​ |  | 27 | ​ |  | 1,912 | ​ |  | 1,413 | ​ |  | 77 | ​ |  | 55
Expected return on plan assets | ​ |  | (969) | ​ |  | (1,228) | ​ |  | — | ​ |  | — | ​ |  | (1,939) | ​ |  | (2,455) | ​ |  | — | ​ |  | —
Net amortization of prior service cost | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Net amortization of net (gain) loss | ​ | ​ | 188 | ​ | ​ | 314 | ​ | ​ | (13) | ​ | ​ | — | ​ | ​ | 376 | ​ | ​ | 629 | ​ | ​ | (26) | ​ | ​ | —
Net Periodic Benefit Cost | ​ | $ | 332 | ​ | $ | 91 | ​ | $ | 31 | ​ | $ | 36 | ​ | $ | 663 | ​ | $ | 182 | ​ | $ | 61 | ​ | $ | 72
​ Employer Contributions First Financial Corporation previously disclosed in its financial statements for the year ended December 31, 2022 that it expected to contribute zero and $642 thousand respectively to its Pension Plan and ESOP and $245 thousand to the Post Retirement Health Benefits Plan in 2023. No contributions have been made to the Pension Plan thus far in 2023. Contributions of $110 thousand have been made through the first six months of 2023 for the Post Retirement Health Benefits plan. No contributions have been made in 2023 for the ESOP. The Pension plan was frozen for most employees at the end of 2012 and for those employees there will be discretionary contributions to the ESOP plan and a 401K plan in place of the former Pension benefit. In the first six months of 2023 and 2022 there has been $1.3 million and $849 thousand of expense accrued for potential contributions to these alternative retirement benefit options.

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