OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains (losses)	$ 3	$ 114	$ 233
Income tax expense	(16,651)	(12,626)	(11,692)
NET INCOME	71,109	52,987	53,844
Amount reclassified from accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	(942)	(1,469)	(1,300)
Unrealized gains and (Losses) on available- for-sale Securities | Amount reclassified from accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains (losses)	3	114	233
Income tax expense	(1)	(29)	(58)
NET INCOME	2	85	175
Retirement plans | Amount reclassified from accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Change in funded status of post retirement benefits	(1,259)	(2,072)	(1,967)
Income tax expense	315	518	492
NET INCOME	$ (944)	$ (1,554)	$ (1,475)