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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net unrealized gain (loss) arising during the period
Before Tax	$ (1,537)		$ 93		$ (2,985)	$ 1,930
Other comprehensive income
Before Tax	(25,406)		3,677		(56,131)	(1,112)
Tax Effect	5,790		(858)		12,857	254
Total other comprehensive (loss) income	(19,616)	$ (23,658)	2,819	$ (3,677)	(43,274)	(858)
Net unrealized gain (loss) on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax	(23,409)		3,607		(52,244)	(3,578)
Tax Effect	5,330		(842)		11,962	830
Net of Tax	(18,079)		2,765		(40,282)	(2,748)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax			50		9	50
Tax Effect			(12)		(2)	(12)
Net of Tax	0		38		7	38
Other comprehensive income
Before Tax	(23,409)		3,557		(52,253)	(3,628)
Tax Effect	5,330		(830)		11,964	842
Total other comprehensive (loss) income	(18,079)		2,727		(40,289)	(2,786)
Net unrealized gain (loss) on hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(1,997)		120		(3,878)	2,516
Tax Effect	460		(28)		893	(588)
Net of Tax	(1,537)		92		(2,985)	1,928
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0		0		0	0
Other comprehensive income
Before Tax	(1,997)		120		(3,878)	2,516
Tax Effect	460		(28)		893	(588)
Total other comprehensive (loss) income	(1,537)		92		(2,985)	1,928
Net unrealized gain (loss) on post-retirement plans
Net unrealized gain (loss) arising during the period
Net of Tax	0		0		0	0
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0		0		0	0
Other comprehensive income
Total other comprehensive (loss) income	$ 0		$ 0		$ 0	$ 0

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