SHAREHOLDERS’ EQUITY - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,473,177	$ 1,092,497	$ 1,529,116	$ 1,078,975
Ending balance	1,447,412	1,118,301	1,447,412	1,118,301
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(59,260)	26,177	18,777	37,120
Net change	(49,221)	2,095	(127,258)	(8,848)
Transfer from available-for-sale to held-to-maturity			0
Ending balance	(108,481)	28,272	(108,481)	28,272
Net Unrealized Gain (Loss) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(74,279)	11,400	5,271	22,320
Net change	(49,242)	2,850	(128,595)	(8,070)
Transfer from available-for-sale to held-to-maturity			(197)
Ending balance	(123,521)	14,250	(123,521)	14,250
Unamortized Gain (Loss) on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	15,177	18,159	15,684	19,308
Net change	(701)	(837)	(1,405)	(1,986)
Transfer from available-for-sale to held-to-maturity			197
Ending balance	14,476	17,322	14,476	17,322
Net Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(158)	(3,382)	(2,178)	(4,508)
Net change	722	82	2,742	1,208
Transfer from available-for-sale to held-to-maturity			0
Ending balance	$ 564	$ (3,300)	$ 564	$ (3,300)