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EMPLOYEE BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Employee Benefit Plan Amounts Recognized in the Consolidated Balance Sheets and Consolidated Statements of Income
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 endedNine months ended
September 30,September 30,
(Dollars in thousands)2023202220232022
Service cost$2,304 $2,153 $6,988 $6,912 
Interest cost1,066 661 3,213 1,923 
Expected return on assets(2,701)(2,743)(8,101)(8,240)
Amortization of prior service cost(76)6(226)
Net actuarial loss208 416 528 1,221 
     Net periodic benefit cost (income)$882 $411 $2,634 $1,590