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COMPREHENSIVE INCOME (LOSS) - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
COMPREHENSIVE INCOME (LOSS) |  |  |
Unrealized holding gains (losses) on available-for-sale debt securities | $ 11,512 | $ (69,828) | $ (8,669)
Unrealized holding losses on available-for-sale debt securities, Income Tax Effect | (2,418) | 14,665 | 1,821
Unrealized holding gains (losses) on available-for-sale debt securities, Net of Tax Amount | 9,094 | (55,163) | (6,848)
Reclassification adjustment for gains realized in income | 3,036 | (20) | (24)
Reclassification adjustment for gains realized in income, Income Tax Effect | (638) | 4 | 5
Reclassification adjustment for gains realized in income. Net of Tax Amount | 2,398 | (16) | (19)
Other comprehensive loss from available-for-sale debt securities, Before-Tax Amount | 14,548 | (69,848) | (8,693)
Other comprehensive loss on available-for-sale debt securities, Income tax effect | (3,056) | 14,669 | 1,826
Other comprehensive loss from available-for-sale debt securities, Net-of-Tax Amount | 11,492 | (55,179) | (6,867)
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount | (9) | 389 | 140
Changes from plan amendments and actuarial gains and losses, Income Tax Effect | 2 | (81) | (29)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount | (7) | 308 | 111
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Before-Tax Amount | (56) | (42) | (17)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect | 12 | 9 | 4
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount | (44) | (33) | (13)
Other comprehensive (loss) income on pension and postretirement obligations | (65) | 347 | 123
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect | 14 | (72) | (25)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount | (51) | 275 | 98
Other comprehensive income (loss) before income tax | 14,483 | (69,501) | (8,570)
Total other comprehensive loss, Income Tax Effect | (3,042) | 14,597 | 1,801
Total other comprehensive loss, Net-of-Tax Amount | $ 11,441 | $ (54,904) | $ (6,769)

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