ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Other income - net realized gains (losses) on sales of available for sale securities	$ (1,650)	$ 481	$ (4,613)	$ 1,137
Interest expense - subordinated debentures and term loans	2,506	2,105	7,303	5,780
Income tax expense	(9,005)	(9,793)	(31,021)	(20,938)
Total reclassifications for the period, net of tax	56,366	63,752	181,307	151,329	$ 151,329
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(1,304)	318	(3,656)	506
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Other income - net realized gains (losses) on sales of available for sale securities	(1,650)	481	(4,613)	1,137
Income tax expense	346	(101)	969	(239)
Total reclassifications for the period, net of tax	(1,304)	380	(3,644)	898
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	16	3	104
Total reclassifications for the period, net of tax	0	(62)	(12)	(392)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges | Interest rate contracts
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Interest expense - subordinated debentures and term loans	$ 0	$ (78)	$ (15)	$ (496)