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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Amounts Recognized in Balance Sheet and Income Statement [Table Text Block] | The following tables set forth information concerning amounts recognized in First Financial's Consolidated Balance Sheets and Consolidated Statements of Income related to the Company's pension plan:
|  | December 31,
(Dollars in thousands) |  | 2018 |  | 2017
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 71,154 |  |  | $ | 62,729 |
Service cost |  | 6,501 |  |  | 4,894 |
Interest cost |  | 2,394 |  |  | 2,325 |
Actuarial (gain) loss |  | (4,032 | ) |  | 6,107 |
Benefits paid, excluding settlement |  | (7,731 | ) |  | (4,901 | )
Benefit obligation at end of year |  | 68,286 |  |  | 71,154 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 144,349 |  |  | 131,011 |
Actual return on plan assets |  | (6,540 | ) |  | 18,239 |
Benefits paid, excluding settlement |  | (7,731 | ) |  | (4,901 | )
Fair value of plan assets at end of year |  | 130,078 |  |  | 144,349 |
Amounts recognized in the Consolidated Balance Sheets |  |  |  |
Assets |  | 61,792 |  |  | 73,195 |
Liabilities |  | 0 |  |  | 0 |
Net amount recognized |  | $ | 61,792 |  |  | $ | 73,195 |
Amounts recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial loss |  | $ | 43,711 |  |  | $ | 33,580 |
Net prior service cost |  | (1,508 | ) |  | (1,921 | )
Deferred tax assets |  | (9,613 | ) |  | (12,028 | )
Net amount recognized |  | $ | 32,590 |  |  | $ | 19,631 |
Change in accumulated other comprehensive income (loss) |  | $ | 12,959 |  |  | $ | (3,172 | )
Accumulated benefit obligation |  | $ | 66,320 |  |  | $ | 69,678 |
Schedule of Components of Net Periodic Benefit Cost [Table Text Block] |
Components of net periodic benefit cost |  |  |  |  |  |
|  | December 31,
(Dollars in thousands) |  | 2018 |  | 2017 |  | 2016
Service cost |  | $ | 6,501 |  |  | $ | 4,894 |  |  | $ | 5,034 |
Interest cost |  | 2,394 |  |  | 2,325 |  |  | 2,262 |
Expected return on assets |  | (9,811 | ) |  | (9,358 | ) |  | (9,644 | )
Amortization of prior service cost |  | (413 | ) |  | (413 | ) |  | (413 | )
Recognized net actuarial loss |  | 2,188 |  |  | 1,924 |  |  | 1,608 |
Net periodic benefit (income) cost |  | 859 |  |  | (628 | ) |  | (1,153 | )
Other changes recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial (gain) loss |  | 12,319 |  |  | (2,775 | ) |  | (884 | )
Prior service cost |  | 0 |  |  | 0 |  |  | 0 |
Amortization of prior service cost |  | 413 |  |  | 413 |  |  | 413 |
Amortization of gain |  | (2,188 | ) |  | (1,924 | ) |  | (1,608 | )
Total recognized in accumulated other comprehensive income (loss) |  | 10,544 |  |  | (4,286 | ) |  | (2,079 | )
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss) |  | $ | 11,403 |  |  | $ | (4,914 | ) |  | $ | (3,232 | )
Amount expected to be recognized in net periodic pension expense in the coming year |  |  |  |
Amortization of (gain) loss |  | $ | 1,867 |  |  | $ | 2,090 |  |  | $ | 1,754 |
Amortization of prior service credit |  | (413 | ) |  | (413 | ) |  | (413 | )
Schedule of Assumptions Used [Table Text Block] |
Pension plan assumptions |  |  |  |  |  |
|  | December 31,
|  | 2018 |  | 2017 |  | 2016
Benefit obligations |  |  |  |  |  |
Discount rate |  | 4.31 | % |  | 3.43 | % |  | 3.88 | %
Rate of compensation increase |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Net periodic benefit cost |  |  |  |  |  |
Discount rate |  | 3.43 | % |  | 3.88 | % |  | 4.05 | %
Expected return on plan assets |  | 7.25 | % |  | 7.25 | % |  | 7.50 | %
Rate of compensation increase |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | The fair value of the plan assets as of December 31, 2018 by asset category is shown in the table that follows:
|  | Fair Value Measurements
(Dollars in thousands) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Asset Category |  |  |  |  |  |  |  |
Cash |  | $ | 216 |  |  | $ | 216 |  |  | $ | 0 |  |  | $ | 0 |
U. S. Government agencies |  | 8,053 |  |  | 0 |  |  | 8,053 |  |  | 0 |
Fixed income mutual funds |  | 74,453 |  |  | 74,453 |  |  | 0 |  |  | 0 |
Equity mutual funds |  | 47,356 |  |  | 47,356 |  |  | 0 |  |  | 0 |
Total |  | $ | 130,078 |  |  | $ | 122,025 |  |  | $ | 8,053 |  |  | $ | 0 |
The fair value of the plan assets as of December 31, 2017 by asset category is shown in the table that follows:
|  | Fair Value Measurements
(Dollars in thousands) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Asset Category |  |  |  |  |  |  |  |
Cash |  | $ | 175 |  |  | $ | 175 |  |  | $ | 0 |  |  | $ | 0 |
U. S. Government agencies |  | 6,853 |  |  | 0 |  |  | 6,853 |  |  | 0 |
Fixed income mutual funds |  | 69,154 |  |  | 69,154 |  |  | 0 |  |  | 0 |
Equity mutual funds |  | 68,167 |  |  | 68,167 |  |  | 0 |  |  | 0 |
Total |  | $ | 144,349 |  |  | $ | 137,496 |  |  | $ | 6,853 |  |  | $ | 0 |
Schedule of Expected Benefit Payments [Table Text Block] | The following benefit payments, which reflect expected future service, are expected to be paid:
(Dollars in thousands) |  |
2019 |  | $ | 4,396 |
2020 |  | 5,280 |
2021 |  | 5,229 |
2022 |  | 4,739 |
2023 |  | 4,917 |
Thereafter |  | 29,948 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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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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