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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Six months ended
|  | June 30, |  | June 30,
(Dollars in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 1,239 |  |  | $ | 1,309 |  |  | $ | 2,477 |  |  | $ | 2,617 |
Interest cost |  | 589 |  |  | 581 |  |  | 1,178 |  |  | 1,162 |
Expected return on assets |  | (2,481 | ) |  | (2,432 | ) |  | (4,962 | ) |  | (4,863 | )
Amortization of prior service cost |  | (104 | ) |  | (104 | ) |  | (207 | ) |  | (207 | )
Net actuarial loss |  | 439 |  |  | 421 |  |  | 877 |  |  | 841 |
Net periodic benefit (income) cost |  | $ | (318 | ) |  | $ | (225 | ) |  | $ | (637 | ) |  | $ | (450 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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