FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 911,425	$ 590,455	$ 716,793	$ 0
Transfer from held-to-maturity to available for sale at fair value	0	0	0	480,437
Additions	130,268	162,903	538,727	436,242
Cash received	(23,083)	(42,741)	(89,905)	(134,101)
In-kind distributions (non-cash)	0		0	(12,730)
Change in fair value	$ (19,179)	$ 5,083	$ (86,273)	$ 11,450
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, net of recoveries	$ (76,049)	$ (37,316)	$ (155,960)	$ (115,644)
Balance, end of period	923,382	665,654	923,382	665,654
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	853,418	481,818	626,368	0
Transfer from held-to-maturity to available for sale at fair value	0	0	10,469	339,041
Additions	130,271	162,903	536,966	432,127
Cash received	(13,077)	(25,942)	(55,649)	(78,208)
In-kind distributions (non-cash)	0	(11,460)	0	(11,460)
Change in fair value	(19,711)	3,984	(87,342)	8,131
Credit-related impairment loss, net of recoveries	(76,049)	(37,316)	(155,960)	(115,644)
Balance, end of period	$ 874,852	$ 573,987	$ 874,852	$ 573,987