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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Schedule of Components of Other Comprehensive (Loss)/Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gains (losses) arising during the period
Net of Tax	$ (177,805)	$ (34,114)	$ 18,874
Less: reclassification adjustment for gains realized in net income
Net of Tax	4	0	(4)
Other comprehensive income (loss)
Total other comprehensive (loss)/income, before tax	(240,074)	(45,801)	25,237
Total income tax benefit/(expense) related to other comprehensive income (loss)	62,265	11,687	(6,359)
Total other comprehensive (loss)/income	(177,809)	(34,114)	18,878
Net unrealized holding (loss) on AFS securities:
Gains (losses) arising during the period
Before Tax	(235,075)	(46,794)	25,721
Tax Effect	60,920	11,937	(6,470)
Net of Tax	(174,155)	(34,857)	19,251
Less: reclassification adjustment for gains realized in net income
Before Tax	6	0	(5)
Tax Effect	(2)	0	1
Net of Tax	4	0	(4)
Other comprehensive income (loss)
Total other comprehensive (loss)/income, before tax	(235,081)	(46,794)	25,726
Total income tax benefit/(expense) related to other comprehensive income (loss)	60,922	11,937	(6,471)
Total other comprehensive (loss)/income	(174,159)	(34,857)	19,255
Net (loss) on effective cash flow hedging derivatives
Gains (losses) arising during the period
Before Tax	(6,667)
Tax Effect	1,789
Net of Tax	(4,878)	0	0
Less: reclassification adjustment for gains realized in net income
Before Tax	0
Tax Effect	0
Net of Tax	0	0	0
Other comprehensive income (loss)
Total other comprehensive (loss)/income, before tax	(6,667)
Total income tax benefit/(expense) related to other comprehensive income (loss)	1,789
Total other comprehensive (loss)/income	(4,878)	0	0
Net unrealized holding (loss) on pension plans
Gains (losses) arising during the period
Before Tax	1,674	993	(489)
Tax Effect	(446)	(250)	112
Net of Tax	1,228	743	(377)
Less: reclassification adjustment for gains realized in net income
Before Tax	0	0	0
Tax Effect	0	0	0
Net of Tax	0	0	0
Other comprehensive income (loss)
Total other comprehensive (loss)/income, before tax	1,674	993	(489)
Total income tax benefit/(expense) related to other comprehensive income (loss)	(446)	(250)	112
Total other comprehensive (loss)/income	$ 1,228	$ 743	$ (377)

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