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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
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) |  | 2019 |  | 2018
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 68,286 |  |  | $ | 71,154 |
Service cost |  | 6,591 |  |  | 6,501 |
Interest cost |  | 2,778 |  |  | 2,394 |
Actuarial (gain) loss |  | 6,848 |  |  | (4,032 | )
Benefits paid, excluding settlement |  | (9,459 | ) |  | (7,731 | )
Benefit obligation at end of year |  | 75,044 |  |  | 68,286 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 130,078 |  |  | 144,349 |
Actual return on plan assets |  | 21,197 |  |  | (6,540 | )
Benefits paid, excluding settlement |  | (9,459 | ) |  | (7,731 | )
Fair value of plan assets at end of year |  | 141,816 |  |  | 130,078 |
Amounts recognized in the Consolidated Balance Sheets |  |  |  |
Assets |  | 66,772 |  |  | 61,792 |
Liabilities |  | 0 |  |  | 0 |
Net amount recognized |  | $ | 66,772 |  |  | $ | 61,792 |
Amounts recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial loss |  | $ | 37,278 |  |  | $ | 43,711 |
Net prior service cost |  | (1,095 | ) |  | (1,508 | )
Deferred tax assets |  | (8,242 | ) |  | (9,613 | )
Net amount recognized |  | $ | 27,941 |  |  | $ | 32,590 |
Change in accumulated other comprehensive income (loss) |  | $ | (4,649 | ) |  | $ | 12,959 |
Accumulated benefit obligation |  | $ | 74,424 |  |  | $ | 66,320 |
Schedule of Components of Net Periodic Benefit Cost [Table Text Block] | The components of net periodic benefit cost are shown in the table that follows:
|  | December 31,
(Dollars in thousands) |  | 2019 |  | 2018 |  | 2017
Service cost |  | $ | 6,591 |  |  | $ | 6,501 |  |  | $ | 4,894 |
Interest cost |  | 2,778 |  |  | 2,394 |  |  | 2,325 |
Expected return on assets |  | (9,718 | ) |  | (9,811 | ) |  | (9,358 | )
Amortization of prior service cost |  | (413 | ) |  | (413 | ) |  | (413 | )
Recognized net actuarial loss |  | 1,803 |  |  | 2,188 |  |  | 1,924 |
Net periodic benefit (income) cost |  | 1,041 |  |  | 859 |  |  | (628 | )
Other changes recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial (gain) loss |  | (4,630 | ) |  | 12,319 |  |  | (2,775 | )
Prior service cost |  | 0 |  |  | 0 |  |  | 0 |
Amortization of prior service cost |  | 413 |  |  | 413 |  |  | 413 |
Amortization of gain |  | (1,803 | ) |  | (2,188 | ) |  | (1,924 | )
Total recognized in accumulated other comprehensive income (loss) |  | (6,020 | ) |  | 10,544 |  |  | (4,286 | )
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss) |  | $ | (4,979 | ) |  | $ | 11,403 |  |  | $ | (4,914 | )
Amount expected to be recognized in net periodic pension expense in the coming year |  |  |  |
Amortization of (gain) loss |  | $ | 2,079 |  |  | $ | 1,867 |  |  | $ | 2,090 |
Amortization of prior service credit |  | (413 | ) |  | (413 | ) |  | (413 | )
Defined Benefit Plan, Assumptions [Table Text Block] | The pension plan assumptions are shown in the table that follows:
|  | December 31,
|  | 2019 |  | 2018 |  | 2017
Benefit obligations |  |  |  |  |  |
Discount rate |  | 3.33 | % |  | 4.31 | % |  | 3.43 | %
Rate of compensation increase |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Net periodic benefit cost |  |  |  |  |  |
Discount rate |  | 4.31 | % |  | 3.43 | % |  | 3.88 | %
Expected return on plan assets |  | 7.25 | % |  | 7.25 | % |  | 7.25 | %
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, 2019 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 |  | $ | 195 |  |  | $ | 195 |  |  | $ | 0 |  |  | $ | 0 |
U. S. Government agencies |  | 5,357 |  |  | 0 |  |  | 5,357 |  |  | 0 |
Fixed income mutual funds |  | 75,720 |  |  | 75,720 |  |  | 0 |  |  | 0 |
Equity mutual funds |  | 60,544 |  |  | 60,544 |  |  | 0 |  |  | 0 |
Total |  | $ | 141,816 |  |  | $ | 136,459 |  |  | $ | 5,357 |  |  | $ | 0 |
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 |
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) |  | Expected benefit payments
2020 |  | $ | 5,611 |
2021 |  | 5,210 |
2022 |  | 5,173 |
2023 |  | 5,125 |
2024 |  | 6,070 |
Thereafter |  | 35,362 |

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