SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income	$ 2,303
Total other comprehensive (loss) income	(60,643)	$ (4,437)	$ 2,948
Ending accumulated other comprehensive income	(58,340)	2,303
Net unrealized (loss) gain on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income	1,985	10,023	5,549
Other comprehensive (loss) gain before reclassifications	(57,190)	(5,840)	8,628
Less: amounts reclassified from accumulated other comprehensive income	41	2,198	4,154
Total other comprehensive (loss) income	(57,231)	(8,038)	4,474
Ending accumulated other comprehensive income	(55,246)	1,985	10,023
Net unrealized gain (loss) on cash flow hedging derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income	870	(1,865)	(600)
Other comprehensive (loss) gain before reclassifications	(2,664)	2,735	(5,200)
Less: amounts reclassified from accumulated other comprehensive income			(3,935)
Total other comprehensive (loss) income	(2,664)	2,735	(1,265)
Ending accumulated other comprehensive income	(1,794)	870	(1,865)
Net unrealized loss on post-retirement plans
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income	(552)	(1,418)	(1,157)
Other comprehensive (loss) gain before reclassifications	(748)	866	(261)
Total other comprehensive (loss) income	(748)	866	(261)
Ending accumulated other comprehensive income	(1,300)	(552)	(1,418)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income	2,303	6,740	3,792
Other comprehensive (loss) gain before reclassifications	(60,602)	(2,239)	3,167
Less: amounts reclassified from accumulated other comprehensive income	41	2,198	219
Total other comprehensive (loss) income	(60,643)	(4,437)	2,948
Ending accumulated other comprehensive income	$ (58,340)	$ 2,303	$ 6,740