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COMPREHENSIVE INCOME (LOSS) - Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
COMPREHENSIVE INCOME (LOSS)        
Unrealized holding losses on available-for-sale debt securities $ (14,865) $ (25,880) $ (12,535) $ (77,923)
Unrealized holding losses on available-for-sale debt securities, Income Tax Effect 3,123 5,437 2,632 16,365
Unrealized holding gains (losses) on available-for-sale debt securities, Net of Tax Amount (11,742) (20,443) (9,903) (61,558)
Reclassification adjustment for gains realized in income 0 (20) (6) (21)
Reclassification adjustment for gains realized in income, Income Tax Effect 0 4 1 4
Reclassification adjustment for gains realized in income. Net of Tax Amount 0 (16) (5) (17)
Other comprehensive loss from available-for-sale debt securities, Before-Tax Amount (14,865) (25,900) (12,541) (77,944)
Other comprehensive loss on available-for-sale debt securities, Income tax effect 3,123 5,441 2,633 16,369
Other comprehensive loss from available-for-sale debt securities, Net-of-Tax Amount (11,742) (20,459) (9,908) (61,575)
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount 0 0 (8) 133
Changes from plan amendments and actuarial gains and losses, Income Tax Effect     1 (27)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount     (7) 106
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Before-Tax Amount (14) (9) (42) (31)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect 3 1 9 5
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount (11) (8) (33) (26)
Other comprehensive (loss) income on pension and postretirement obligations (14) (9) (50) 102
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect 3 1 10 (22)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount (11) (8) (40) 80
Other comprehensive loss before income tax (14,879) (25,909) (12,591) (77,842)
Total other comprehensive loss, Income Tax Effect 3,126 5,442 2,643 16,347
Total other comprehensive loss, Net-of-Tax Amount $ (11,753) $ (20,467) $ (9,948) $ (61,495)