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EMPLOYEE BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS First Financial sponsors a non-contributory defined benefit pension plan which covers substantially all employees and uses a December 31 measurement date. Plan assets are primarily invested in fixed income and publicly traded equity mutual funds. The pension plan does not directly own any shares of First Financial common stock or any other First Financial security or product. First Financial made no cash contributions to fund the pension plan during the three and nine months ended September 30, 2023 or the year ended December 31, 2022, and does not expect to make cash contributions to the plan through the remainder of 2023. As a result of the plan’s actuarial projections, First Financial recorded expense as set forth in the following table. The amounts are recognized in First Financial’s Consolidated Statements of Income related to the Company's pension plan.
|  | Three months ended |  | Nine months ended
|  | September 30, |  | September 30,
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost |  | $ | 2,304 |  |  | $ | 2,153 |  |  | $ | 6,988 |  |  | $ | 6,912 |
Interest cost |  | 1,066 |  |  | 661 |  |  | 3,213 |  |  | 1,923 |
Expected return on assets |  | (2,701) |  |  | (2,743) |  |  | (8,101) |  |  | (8,240) |
Amortization of prior service cost |  | 5 |  |  | (76) |  |  | 6 |  | (226) |
Net actuarial loss |  | 208 |  |  | 416 |  |  | 528 |  |  | 1,221 |
Net periodic benefit cost (income) |  | $ | 882 |  |  | $ | 411 |  |  | $ | 2,634 |  |  | $ | 1,590 |

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