ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	$ 48,599	$ 48,393	$ 48,524	$ 51,519	$ 56,837	$ 52,492	$ 48,678	$ 44,880	$ 197,035	$ 202,887	$ 178,088
Net securities gains (losses)									(25)	21	797
Income tax expense	6,436	4,479	1,880	3,771	4,987	6,237	5,584	4,539	16,566	21,347	21,711
Other expense									10,757	13,124	8,905
NET INCOME	$ 29,626	$ 25,252	$ 14,611	$ 24,278	$ 25,977	$ 28,525	$ 25,673	$ 23,642	93,767	103,817	95,733
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME									(1,633)	(1,290)	448
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and (Losses) on Available-for-Sales Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income									(1,987)	(1,518)
Net securities gains (losses)									(25)	21	797
Income tax expense									423	315	(167)
NET INCOME									(1,589)	(1,182)	630
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense									15	36	60
Other expense									(59)	(144)	(242)
NET INCOME									$ (44)	$ (108)	$ (182)