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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS First Financial sponsors a non-contributory defined benefit pension plan covering substantially all employees and uses a December 31 measurement date for the plan. Plan assets were 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 months ended March 31, 2019, or the year ended December 31, 2018, and does not expect to make cash contributions to the plan through the remainder of 2019. As a result of the plan’s actuarial projections, which included consideration of the impact of the merger with MSFG, First Financial recorded expense of $0.4 million for the three months ended March 31, 2019. Conversely, First Financial recorded income of $0.2 million for the three months ended March 31, 2018. The following table sets forth information concerning amounts recognized in First Financial’s Consolidated Statements of Income related to the Company's pension plan:
|  | Three months ended
|  | March 31,
(Dollars in thousands) |  | 2019 |  | 2018
Service cost |  | $ | 1,750 |  |  | $ | 1,295 |
Interest cost |  | 700 |  |  | 590 |
Expected return on assets |  | (2,450 | ) |  | (2,460 | )
Amortization of prior service cost |  | (100 | ) |  | (103 | )
Net actuarial loss |  | 475 |  |  | 522 |
Net periodic benefit cost (income) |  | $ | 375 |  |  | $ | (156 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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