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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 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 endedSix months ended
June 30,June 30,
(Dollars in thousands)2023202220232022
Service cost$2,334 $2,334 $4,684 $4,759 
Interest cost1,072 637 2,147 1,262 
Expected return on assets(2,700)(2,747)(5,400)(5,497)
Amortization of prior service cost(75)1(150)
Net actuarial loss170 405 320 805 
     Net periodic benefit cost (income)$877 $554 $1,752 $1,179