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RETIREMENT PLANS: (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 100.00% | 100.00% |
Employer contributions | $ 2,092 | $ 2,614 |
Cash contributions to ESOP | (1,251) | (1,087) | $ (1,062)
Cash contributions to ESOP for employees no longer participating in plan | 926 | 735 | 676
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year | 2,000 |  |
Pension plans with accumulated benefit obligations in excess of plan assets, aggregate accumulated benefit obligation | 98,400 | 83,900 |
Pension and other postretirement defined benefit plans, liabilities | 6,700 | 5,000 |
Accumulated other comprehensive income (loss) | (7,501) | (23,454) | (14,704)
Prior service cost (credit) | 1 |  |
First Financial Corporation Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets equity securities | $ 19,800 | $ 18,000 |
Percentage of plan assets (percent) | 27.00% | 28.00% |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 63.00% | 65.00% |
Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 33.00% | 31.00% |
Other Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 4.00% | 4.00% |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1,770 | $ 2,260 | 2,550
Expected contributions to pension plan in 2014 | $ 3,700 |  |
Employee Stock Ownership Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 100.00% | 100.00% |
Cash contributions to ESOP | $ (736) |  |
Employee Stock Ownership Plan | First Financial Corporation Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets equity securities | $ 5,100 | $ 3,800 |
Employee Stock Ownership Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 98.00% | 99.00% |
Employee Stock Ownership Plan | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 0.00% | 0.00% |
Employee Stock Ownership Plan | Other Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percentage Of Plan Assets | 2.00% | 1.00% |
Supplemental Employee Retirement Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year | $ 247 |  |
Pension expense | 339 | $ 411 | 321
Accumulated other comprehensive income (loss), after tax | 2,350 | 1,070 |
Accumulated other comprehensive income (loss) | (27) | (615) |
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions to pension plan in 2014 | 251 |  |
Pension expense | 315 | 325 |
Amortization of transition obligations (assets) | $ (16) | $ 0 | $ 0

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- Definition Assets, equity stocks, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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