COMPREHENSIVE INCOME (LOSS) - Changes of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance, beginning of period	$ 249,325	$ 301,405	$ 299,756
Other comprehensive loss	11,441	(54,904)	(6,769)
Balance, end of period	262,381	249,325	301,405
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Balance, beginning of period	(50,370)	4,809	11,676
Other comprehensive loss	11,492	(55,179)	(6,867)
Balance, end of period	(38,878)	(50,370)	4,809
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Balance, beginning of period	492	217	119
Other comprehensive loss	(51)	275	98
Balance, end of period	441	492	217
Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period	(49,878)	5,026	11,795
Other comprehensive loss	11,441	(54,904)	(6,769)
Balance, end of period	$ (38,437)	$ (49,878)	$ 5,026