ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Other income - net realized gains (losses) on sales of available for sale securities	$ (9,114)	$ (1,650)	$ (9,165)	$ (4,613)
Income tax expense	(7,160)	(9,005)	(18,052)	(31,021)
Total reclassifications for the period, net of tax	49,187	56,366	137,053	181,307
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	(7,200)	(1,304)	(7,240)	(3,656)
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	(9,114)	(1,650)	(9,165)	(4,613)
Income tax expense	1,914	346	1,925	969
Total reclassifications for the period, net of tax	(7,200)	(1,304)	(7,240)	(3,644)
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	0	0	3
Total reclassifications for the period, net of tax	0	0	0	(12)
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	$ 0	$ 0	$ (15)