COMPREHENSIVE INCOME (LOSS) - Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on available-for-sale debt securities, Before-Tax Amount	$ 5,169	$ (2,774)
Unrealized holding (losses) gains on available-for-sale debt securities, Income Tax Effect	(1,135)	581
Unrealized holding (losses) gains on available-for-sale debt securities, Net of Tax Amount	4,034	(2,193)
Reclassification adjustment for (gains) losses realized in income, Before-Tax Amount	0	0
Reclassification adjustment for gains (losses) realized in income, Income Tax Effect	0	0
Reclassification adjustment for (gains) losses realized in income. Net of Tax Amount	0	0
Other comprehensive (loss) income from available-for-sale debt securities, Before-Tax Amount	5,169	(2,774)
Other comprehensive loss (income) from available-for-sale debt securities, Income tax effect	(1,135)	581
Other comprehensive (loss) income from available-for-sale debt securities, Net-of-Tax Amount	4,034	(2,193)
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount	69	394
Changes from plan amendments and actuarial gains and losses, Income Tax Effect	(15)	(83)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount	54	311
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Before-Tax Amount	(22)	(490)
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Income Tax Effect	5	103
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost, Net-of-Tax Amount	(17)	(387)
Other comprehensive loss on unfunded retirement obligations, Before-Tax Amount	47	(96)
Other comprehensive loss on unfunded retirement obligations, Income Tax Effect	(10)	20
Other comprehensive loss on unfunded retirement obligations, Net-of-Tax Amount	37	(76)
Total other comprehensive (income) loss, Before-Tax Amount	5,216	(2,870)
Total other comprehensive income (loss), Income Tax Effect	(1,145)	601
Total other comprehensive income (loss), Net-of-Tax Amount	$ 4,071	$ (2,269)