FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 894,151	$ 507,166	$ 716,793	$ 0
Transfer from held-to-maturity to available for sale at fair value	0	0	0	480,437
Additions	146,821	151,607	408,459	273,339
Cash received	(30,925)	(65,375)	(66,822)	(91,360)
Change in fair value	$ (45,562)	$ 7,037	$ (67,094)	$ 6,366
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Credit-related impairment loss	$ (53,060)	$ (9,980)	$ (79,911)	$ (78,327)
Balance, end of period	911,425	590,455	911,425	590,455
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	825,121	380,266	626,368	0
Transfer from held-to-maturity to available for sale at fair value	0	0	10,469	339,041
Additions	146,821	151,607	406,696	273,339
Cash received	(19,559)	(47,261)	(42,572)	(56,381)
Change in fair value	(45,905)	7,186	(67,632)	4,146
Credit-related impairment loss	(53,060)	(9,980)	(79,911)	(78,327)
Balance, end of period	$ 853,418	$ 481,818	$ 853,418	$ 481,818