ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 704,906	$ 657,184	$ 598,100
Other comprehensive income (loss) before reclassification	(206,306)	(11,203)
Amounts reclassified from accumulated other comprehensive income (loss)	1,290	(448)
Net current period other comprehensive income (loss)	(205,016)	(11,651)	15,685
Balance	568,887	704,906	657,184
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	16,093	27,744
Balance	(188,923)	16,093	27,744
Unrealized Gains and (Losses) on Available-for-Sales Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	17,056	29,182
Other comprehensive income (loss) before reclassification	(206,392)	(11,496)
Amounts reclassified from accumulated other comprehensive income (loss)	1,182	(630)
Net current period other comprehensive income (loss)	(205,210)	(12,126)
Balance	(188,154)	17,056	29,182
Defined Benefit Pension Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(963)	(1,438)
Other comprehensive income (loss) before reclassification	86	293
Amounts reclassified from accumulated other comprehensive income (loss)	108	182
Net current period other comprehensive income (loss)	194	475
Balance	$ (769)	$ (963)	$ (1,438)