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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income		$ 6,740				$ 3,792	$ 6,740	$ 3,792
Total other comprehensive (loss) income	$ 2,818	(3,676)	$ 2,610	$ 1,263	$ 1,801	(2,726)	(4,437)	2,948	$ 15,594
Ending accumulated other comprehensive income			6,740				2,303	6,740	3,792
Net unrealized gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income		10,023				5,549	10,023	5,549	(8,663)
Other comprehensive gain (loss) before reclassifications							(5,840)	8,628	14,394
Less: amounts reclassified from accumulated other comprehensive income							2,198	4,154	182
Total other comprehensive (loss) income							(8,038)	4,474	14,212
Ending accumulated other comprehensive income			10,023				1,985	10,023	5,549
Net unrealized gain (loss) on hedging derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income		(1,865)				(600)	(1,865)	(600)	(2,249)
Other comprehensive gain (loss) before reclassifications							2,735	(5,200)	(770)
Less: amounts reclassified from accumulated other comprehensive income								(3,935)	(2,419)
Total other comprehensive (loss) income							2,735	(1,265)	1,649
Ending accumulated other comprehensive income			(1,865)				870	(1,865)	(600)
Net unrealized gain (loss) on post-retirement plans
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income		(1,418)				(1,157)	(1,418)	(1,157)	(890)
Other comprehensive gain (loss) before reclassifications							866	(261)	(267)
Total other comprehensive (loss) income							866	(261)	(267)
Ending accumulated other comprehensive income			(1,418)				(552)	(1,418)	(1,157)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning accumulated other comprehensive income		$ 6,740				$ 3,792	6,740	3,792	(11,802)
Other comprehensive gain (loss) before reclassifications							(2,239)	3,167	13,357
Less: amounts reclassified from accumulated other comprehensive income							2,198	219	(2,237)
Total other comprehensive (loss) income							(4,437)	2,948	15,594
Ending accumulated other comprehensive income			$ 6,740				$ 2,303	$ 6,740	$ 3,792

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