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EMPLOYEE BENEFIT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Employee Benefit Plan Amounts Recognized in the Consolidated Balance Sheets and Consolidated Statements of Income | 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 |  | Nine months ended
|  | September 30, |  | September 30,
(Dollars in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 1,736 |  |  | $ | 1,238 |  |  | $ | 4,766 |  |  | $ | 3,715 |
Interest cost |  | 601 |  |  | 589 |  |  | 1,792 |  |  | 1,767 |
Expected return on assets |  | (2,450 | ) |  | (2,481 | ) |  | (7,360 | ) |  | (7,443 | )
Amortization of prior service cost |  | (104 | ) |  | (103 | ) |  | (310 | ) |  | (310 | )
Net actuarial loss |  | 556 |  |  | 438 |  |  | 1,633 |  |  | 1,315 |
Net periodic benefit cost (income) |  | $ | 339 |  |  | $ | (319 | ) |  | $ | 521 |  |  | $ | (956 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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