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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2020
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 for the plan. 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 nine months ended September 30, 2020, or the year ended December 31, 2019, and does not expect to make cash contributions to the plan through the remainder of 2020.
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)2020201920202019
Service cost$2,079 $1,649 $5,855 $4,944 
Interest cost624 694 1,831 2,083 
Expected return on assets(2,443)(2,429)(7,382)(7,288)
Amortization of prior service cost(106)(104)(308)(310)
Net actuarial loss625 451 1,709 1,352 
     Net periodic benefit cost (income)$779 $261 $1,705 $781