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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2021
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)2021202020212020
Service cost$2,311 $1,926 $4,661 $3,776 
Interest cost533 607 1,058 1,207 
Expected return on assets(2,538)(2,464)(5,088)(4,939)
Amortization of prior service cost(102)(102)(202)(202)
Net actuarial loss641 559 1,266 1,084 
     Net periodic benefit cost (income)$845 $526 $1,695 $926