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COMPREHENSIVE INCOME - Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
COMPREHENSIVE INCOME |  |  |  |
Unrealized holding income (losses) on available-for-sale debt securities | $ (3,608) | $ (95) | $ (6,781) | $ 9,980
Unrealized holding income (losses) on available-for-sale debt securities, Income Tax Effect | 759 | 19 | 1,425 | (2,095)
Unrealized holding income (losses) on available-for-sale debt securities, Net of Tax Amount | (2,849) | (76) | (5,356) | 7,885
Reclassification adjustment for gains realized in income, Before-Tax Amount | (23) | (25) | (25) | (25)
Reclassification adjustment for (gains) realized in income, Income Tax Effect | 5 | 5 | 5 | 5
Reclassification adjustment for (gains) realized in income. Net of Tax Amount | (18) | (20) | (20) | (20)
Other comprehensive loss from available-for-sale debt securities, Before-Tax Amount | (3,631) | (120) | (6,806) | 9,955
Other comprehensive income on available-for-sale debt securities, income tax effect | 764 | 24 | 1,430 | (2,090)
Other comprehensive loss from available-for-sale debt securities, Net-of-Tax Amount | (2,867) | (96) | (5,376) | 7,865
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount | 0 | 0 | (5) | 88
Changes from plan amendments and actuarial gains and losses, Income Tax Effect |  |  | 1 | (18)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount |  |  | (4) | 70
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Before-Tax Amount | (5) | (8) | (13) | (22)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect | 1 | 2 | 3 | 5
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount | (4) | (6) | (10) | (17)
Other comprehensive (loss) income on unfunded retirement obligations | (5) | (8) | (18) | 66
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect |  |  | 4 | (13)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount |  |  | (14) | 53
Other comprehensive (loss) income before income tax | (3,636) | (128) | (6,824) | 10,021
Total other comprehensive income (loss), Income Tax Effect | 765 | 26 | 1,434 | (2,103)
Total other comprehensive income (loss) | $ (2,871) | $ (102) | $ (5,390) | $ 7,918

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