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COMPREHENSIVE INCOME - Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
COMPREHENSIVE INCOME |  |  |  |
Unrealized holding income (losses) on available-for-sale debt securities | $ 2,941 | $ 2,835 | $ (3,173) | $ 10,075
Unrealized holding income (losses) on available-for-sale debt securities, Income Tax Effect | (619) | (593) | 666 | (2,114)
Unrealized holding income (losses) on available-for-sale debt securities, Net of Tax Amount | 2,322 | 2,242 | (2,507) | 7,961
Reclassification adjustment for gains realized in income, Before-Tax Amount | (2) | 0 | (2) | 0
Reclassification adjustment for (gains) realized in income, Income Tax Effect | 0 |  | 0 |
Reclassification adjustment for (gains) realized in income. Net of Tax Amount | (2) |  | (2) |
Unrealized holding gains on available-for-sale debt securities, Before-Tax Amount | 2,939 | 2,835 | (3,175) | 10,075
Other comprehensive income on available-for-sale debt securities, income tax effect | (619) |  | 666 |
Unrealized holding gains on available-for-sale debt securities, Net-of-Tax Amount | 2,320 |  | (2,509) |
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 | (4) | (6) | (8) | (14)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect | 1 | 1 | 2 | 3
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount | (3) | (5) | (6) | (11)
Other comprehensive (loss) income on unfunded retirement obligations | (4) | (6) | (13) | 74
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect | 1 |  | 3 | (15)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount | (3) |  | (10) | 59
Other comprehensive income (loss) before income tax | 2,935 | 2,829 | (3,188) | 10,149
Total other comprehensive income (loss), Income Tax Effect | (618) | (592) | 669 | (2,129)
Total other comprehensive income (loss) | $ 2,317 | $ 2,237 | $ (2,519) | $ 8,020

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