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Components of Net Periodic Benefit Cost
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
Three Months Ended March 31,
(Dollar amounts in thousands)Pension BenefitsPost-Retirement
Health Benefits
 2022202120222021
Service cost$297 $339 $8 $11 
Interest cost706 658 28 26 
Expected return on plan assets(1,227)(1,178)— — 
Net amortization of prior service cost— — — — 
Net amortization of net (gain) loss315 518 — — 
Net Periodic Benefit Cost$91 $337 $36 $37 
 
Employer Contributions
 
First Financial Corporation previously disclosed in its financial statements for the year ended December 31, 2021 that it expected to contribute $250 thousand and $703 thousand respectively to its Pension Plan and ESOP and $248 thousand to the Post Retirement Health Benefits Plan in 2022. Contributions of $32 thousand have been made to the Pension Plan thus far in 2022. Contributions of $57 thousand have been made through the first three months of 2022 for the Post Retirement Health Benefits plan. No contributions have been made in 2022 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 three months of 2022 and 2021 there has been $849 thousand and $552 thousand of expense accrued for potential contributions to these alternative retirement benefit options.