COMPREHENSIVE INCOME (LOSS) - Changes of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance, beginning of period	$ 248,117	$ 258,619	$ 249,325	$ 301,405
Other comprehensive loss	(11,753)	(20,467)	(9,948)	(61,495)
Balance, end of period	240,205	238,789	240,205	238,789
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Balance, beginning of period	(48,536)	(36,307)	(50,370)	4,809
Other comprehensive loss	(11,742)	(20,459)	(9,908)	(61,575)
Balance, end of period	(60,278)	(56,766)	(60,278)	(56,766)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Balance, beginning of period	463	305	492	217
Other comprehensive loss	(11)	(8)	(40)	80
Balance, end of period	452	297	452	297
Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period	(48,073)	(36,002)	(49,878)	5,026
Other comprehensive loss	(11,753)	(20,467)	(9,948)	(61,495)
Balance, end of period	$ (59,826)	$ (56,469)	$ (59,826)	$ (56,469)