ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 568,887	$ 704,906	$ 657,184
Other comprehensive income (loss) before reclassification	32,095	(206,306)
Amounts reclassified from accumulated other comprehensive income (loss)	1,633	1,290
Net current period other comprehensive income (loss)	33,728	(205,016)	(11,651)
Balance	649,793	568,887	704,906
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(188,923)	16,093
Balance	(155,195)	(188,923)	16,093
Unrealized Gains and (Losses) on Available-for-Sales Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(188,154)	17,056
Other comprehensive income (loss) before reclassification	32,105	(206,392)
Amounts reclassified from accumulated other comprehensive income (loss)	1,589	1,182
Net current period other comprehensive income (loss)	33,694	(205,210)
Balance	(154,460)	(188,154)	17,056
Defined Benefit Pension Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(769)	(963)
Other comprehensive income (loss) before reclassification	(10)	86
Amounts reclassified from accumulated other comprehensive income (loss)	44	108
Net current period other comprehensive income (loss)	34	194
Balance	$ (735)	$ (769)	$ (963)