SHAREHOLDERS’ EQUITY AND COMPENSATION PLANS - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,529,116	$ 1,078,975
Ending balance	1,473,177	1,092,497
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	5,271	22,320
Net change	(79,353)	(10,920)
Transfer from available-for-sale to held-to-maturity	(197)
Ending balance	(74,279)	11,400
Unamortized Gain (Loss) on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	15,684	19,308
Net change	(704)	(1,149)
Transfer from available-for-sale to held-to-maturity	197
Ending balance	15,177	18,159
Net Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,178)	(4,508)
Net change	2,020	1,126
Transfer from available-for-sale to held-to-maturity	0
Ending balance	(158)	(3,382)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18,777	37,120
Net change	(78,037)	(10,943)
Transfer from available-for-sale to held-to-maturity	0
Ending balance	$ (59,260)	$ 26,177