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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (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
Net unrealized gain (loss) arising during the period
Before Tax							$ 4,455	$ (3,084)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax								(3,935)
Other comprehensive income
Before Tax							(5,795)	3,830	$ 20,356
Tax Effect							1,358	(882)	(4,762)
Total other comprehensive (loss) income	$ 2,818	$ (3,676)	$ 2,610	$ 1,263	$ 1,801	$ (2,726)	(4,437)	2,948	15,594
Net unrealized gain (loss) on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax							(7,619)	11,264	18,883
Tax Effect							1,779	(2,636)	(4,489)
Net of Tax							(5,840)	8,628	14,394
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax							2,870	5,445	237
Tax Effect							(672)	(1,291)	(55)
Net of Tax							2,198	4,154	182
Other comprehensive income
Before Tax							(10,489)	5,819	18,646
Tax Effect							2,451	(1,345)	(4,434)
Total other comprehensive (loss) income							(8,038)	4,474	14,212
Net unrealized gain (loss) on hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax							3,562	(6,503)	(1,096)
Tax Effect							(827)	1,303	326
Net of Tax							2,735	(5,200)	(770)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax								(4,852)	(3,156)
Tax Effect								917	737
Net of Tax								(3,935)	(2,419)
Other comprehensive income
Before Tax							3,562	(1,651)	2,060
Tax Effect							(827)	386	(411)
Total other comprehensive (loss) income							2,735	(1,265)	1,649
Net unrealized gain (loss) on post-retirement plans
Net unrealized gain (loss) arising during the period
Before Tax							1,132	(338)	(350)
Tax Effect							(266)	77	83
Net of Tax							866	(261)	(267)
Other comprehensive income
Before Tax							1,132	(338)	(350)
Tax Effect							(266)	77	83
Total other comprehensive (loss) income							$ 866	$ (261)	$ (267)

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