COMPREHENSIVE INCOME (LOSS) - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on available-for-sale debt securities, Before-Tax Amount	$ 1,670	$ 11,512	$ (69,828)
Unrealized holding (losses) gains on available-for-sale debt securities, Income Tax Effect	124	(2,418)	14,665
Unrealized holding (losses) gains on available-for-sale debt securities, Net of Tax Amount	1,794	9,094	(55,163)
Reclassification adjustment for (gains) losses realized in income, Before-Tax Amount	0	3,036	(20)
Reclassification adjustment for gains (losses) realized in income, Income Tax Effect	0	(638)	4
Reclassification adjustment for (gains) losses realized in income. Net of Tax Amount	0	2,398	(16)
Other comprehensive (loss) income from available-for-sale debt securities, Before-Tax Amount	1,670	14,548	(69,848)
Other comprehensive loss (income) from available-for-sale debt securities, Income tax effect	124	(3,056)	14,669
Other comprehensive (loss) income from available-for-sale debt securities, Net-of-Tax Amount	1,794	11,492	(55,179)
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount	405	(9)	389
Changes from plan amendments and actuarial gains and losses, Income Tax Effect	(87)	2	(81)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount	318	(7)	308
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Before-Tax Amount	(552)	(56)	(42)
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Income Tax Effect	116	12	9
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Net-of-Tax Amount	(436)	(44)	(33)
Other comprehensive loss on unfunded retirement obligations, Before-Tax Amount	(147)	(65)	347
Other comprehensive loss on unfunded retirement obligations, Income Tax Effect	29	14	(72)
Other comprehensive loss on unfunded retirement obligations, Net-of-Tax Amount	(118)	(51)	275
Total other comprehensive (income) loss, Before-Tax Amount	1,523	14,483	(69,501)
Total other comprehensive income (loss), Income Tax Effect	153	(3,042)	14,597
Total other comprehensive income (loss), Net-of-Tax Amount	$ 1,676	$ 11,441	$ (54,904)