CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net unrealized gain (loss) arising during the period
Before Tax	$ (1,206)	$ (155)			$ (4,192)	$ 1,775
Other comprehensive (loss) income
Before Tax	(28,501)	(3,903)			(84,632)	(5,017)
Tax Effect	6,883	909			19,740	1,165
Total other comprehensive loss	(21,618)	(2,994)	$ (43,274)	$ (858)	(64,892)	(3,852)
Net unrealized gain (loss) on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax	(26,889)	(1,770)			(79,133)	(5,348)
Tax Effect	6,512	403			18,474	1,234
Net of Tax	(20,377)	(1,367)			(60,659)	(4,114)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	44	1,930			53	1,980
Tax Effect	(10)	(458)			(12)	(469)
Net of Tax	34	1,472			41	1,511
Other comprehensive (loss) income
Before Tax	(26,933)	(3,700)			(79,186)	(7,328)
Tax Effect	6,522	861			18,486	1,703
Total other comprehensive loss	(20,411)	(2,839)			(60,700)	(5,625)
Net unrealized gain (loss) on hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(1,568)	(203)			(5,446)	2,311
Tax Effect	361	48			1,254	(538)
Net of Tax	(1,207)	(155)			(4,192)	1,773
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0	0			0	0
Other comprehensive (loss) income
Before Tax	(1,568)	(203)			(5,446)	2,311
Tax Effect	361	48			1,254	(538)
Total other comprehensive loss	(1,207)	(155)			(4,192)	1,773
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 (loss) income
Total other comprehensive loss	$ 0	$ 0			$ 0	$ 0