ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 654,590	$ 591,995	$ 649,793	$ 568,887
Net current period other comprehensive (loss) income	32,322	(50,466)	17,059	(39,188)
Ending balance	699,181	557,184	699,181	557,184
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(170,458)	(177,645)	(155,195)	(188,923)
Other comprehensive income (loss) before reclassification	31,925	(50,900)	15,825	(40,407)
Amounts reclassified from accumulated other comprehensive income (loss)	397	434	1,234	1,219
Net current period other comprehensive (loss) income	32,322	(50,466)	17,059	(39,188)
Ending balance	(138,136)	(228,111)	(138,136)	(228,111)
Unrealized Gains and Losses on Available- for-Sales Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(169,746)	(176,898)	(154,460)	(188,154)
Other comprehensive income (loss) before reclassification	31,925	(50,900)	15,825	(40,407)
Amounts reclassified from accumulated other comprehensive income (loss)	385	423	1,199	1,186
Net current period other comprehensive (loss) income	32,310	(50,477)	17,024	(39,221)
Ending balance	(137,436)	(227,375)	(137,436)	(227,375)
Defined Benefit Pension Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(712)	(747)	(735)	(769)
Other comprehensive income (loss) before reclassification	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	12	11	35	33
Net current period other comprehensive (loss) income	12	11	35	33
Ending balance	$ (700)	$ (736)	$ (700)	$ (736)