SHAREHOLDERS’ EQUITY - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,592,820	$ 1,473,177	$ 1,522,263	$ 1,529,116
Ending balance	1,618,233	1,447,412	1,618,233	1,447,412
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(105,975)	(59,260)	(130,332)	18,777
Net change	(17,490)	(49,221)	6,867	(127,258)
Transfer from available-for-sale to held-to-maturity				0
Ending balance	(123,465)	(108,481)	(123,465)	(108,481)
Net Unrealized Gain (Loss) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(120,856)	(74,279)	(144,549)	5,271
Net change	(13,677)	(49,242)	10,016	(128,595)
Transfer from available-for-sale to held-to-maturity				(197)
Ending balance	(134,533)	(123,521)	(134,533)	(123,521)
Unamortized Gain (Loss) on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,547	15,177	13,185	15,684
Net change	(686)	(701)	(1,324)	(1,405)
Transfer from available-for-sale to held-to-maturity				197
Ending balance	11,861	14,476	11,861	14,476
Net Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,334	(158)	1,032	(2,178)
Net change	(3,127)	722	(1,825)	2,742
Transfer from available-for-sale to held-to-maturity				0
Ending balance	$ (793)	$ 564	$ (793)	$ 564