ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Each Classification of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 709,987	$ 654,590	$ 683,911	$ 649,793
Net current period other comprehensive income (loss)	20,418	32,322	25,797	17,059
Ending balance	747,503	699,181	747,503	699,181
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(161,121)	(170,458)	(166,500)	(155,195)
Other comprehensive income (loss) before reclassification	20,023	31,925	24,608	15,825
Amounts reclassified from accumulated other comprehensive income (loss)	395	397	1,189	1,234
Net current period other comprehensive income (loss)	20,418	32,322	25,797	17,059
Ending balance	(140,703)	(138,136)	(140,703)	(138,136)
Unrealized Gains and Losses on Available- for-Sales Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(160,573)	(169,746)	(165,932)	(154,460)
Other comprehensive income (loss) before reclassification	20,023	31,925	24,608	15,825
Amounts reclassified from accumulated other comprehensive income (loss)	385	385	1,159	1,199
Net current period other comprehensive income (loss)	20,408	32,310	25,767	17,024
Ending balance	(140,165)	(137,436)	(140,165)	(137,436)
Defined Benefit Pension Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(548)	(712)	(568)	(735)
Other comprehensive income (loss) before reclassification	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	10	12	30	35
Net current period other comprehensive income (loss)	10	12	30	35
Ending balance	$ (538)	$ (700)	$ (538)	$ (700)