SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net unrealized gain (loss) arising during the period
Before Tax	$ 704	$ 4,455
Other comprehensive (loss) income
Before Tax	(78,848)	(5,795)	$ 3,830
Tax Effect	18,205	1,358	(882)
Total other comprehensive (loss) income	(60,643)	(4,437)	2,948
Net unrealized (loss) gain on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax	(74,359)	(7,619)	11,264
Tax Effect	17,169	1,779	(2,636)
Net of Tax	(57,190)	(5,840)	8,628
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	53	2,870	5,445
Tax Effect	(12)	(672)	(1,291)
Net of Tax	41	2,198	4,154
Other comprehensive (loss) income
Before Tax	(74,412)	(10,489)	5,819
Tax Effect	17,181	2,451	(1,345)
Total other comprehensive (loss) income	(57,231)	(8,038)	4,474
Net unrealized gain (loss) on cash flow hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(3,463)	3,562	(6,503)
Tax Effect	799	(827)	1,303
Net of Tax	(2,664)	2,735	(5,200)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax			(4,852)
Tax Effect			917
Net of Tax			(3,935)
Other comprehensive (loss) income
Before Tax	(3,463)	3,562	(1,651)
Tax Effect	799	(827)	386
Total other comprehensive (loss) income	(2,664)	2,735	(1,265)
Net unrealized loss on post-retirement plans
Net unrealized gain (loss) arising during the period
Before Tax	(973)	1,132	(338)
Tax Effect	225	(266)	77
Net of Tax	(748)	866	(261)
Other comprehensive (loss) income
Before Tax	(973)	1,132	(338)
Tax Effect	225	(266)	77
Total other comprehensive (loss) income	$ (748)	$ 866	$ (261)