SHAREHOLDERS’ EQUITY AND COMPENSATION PLANS - Pre-tax and After-tax Changes in the Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax [Abstract]
Change in unrealized gain on available-for-sale debt securities, before tax	$ (106,087)	$ (14,541)
Change in unrealized gain on available-for-sale debt securities, tax	(26,734)	(3,621)
Change in unrealized gain on available-for-sale debt securities, after tax	(79,353)	(10,920)
Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments [Abstract]
Reclassification of (gain) loss on held-to-maturity securities, before tax	(941)	(1,530)
Reclassification of (gain) loss on held-to-maturity securities, tax	(237)	(381)
Reclassification of (gain) loss on held-to-maturity securities, after tax	(704)	(1,149)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract]
Change in unrealized loss on cash flow hedges arising during the period, before tax	2,341	1,128
Change in unrealized loss on cash flow hedges arising during the period, tax	590	281
Change in unrealized loss on cash flow hedges arising during the period, after tax	1,751	847
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Reclassification of loss on cash flow hedges, before tax	359	372
Reclassification of loss on cash flow hedges, tax	90	93
Reclassification of loss on cash flow hedges, after tax	(269)	(279)
OCI, Net of Tax [Abstract]
Total other comprehensive income, before tax	(104,328)	(14,571)
Total other comprehensive income, tax	(26,291)	(3,628)
Total other comprehensive loss, after-tax	$ (78,037)	$ (10,943)