FAIR VALUE MEASUREMENT - Schedule of Level 3 Roll Forward (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments in securities under the fair value option
Balance, beginning of period	$ 736,735	$ 853,418	$ 663,189	$ 626,368
Transfer from Level 2	0	0	0	10,469
Additions	67,811	130,271	316,789	536,966
Cash received	(40,407)	(13,077)	(148,423)	(55,649)
Gain on sale of Investments in loans and securities	2	0	8,595	0
Loss on sale of Investments in loans and securities	(16,279)	0	(16,279)	0
Change in accrued interest on investments	10,599	0	20,497	0
Change in fair value and other adjustments (OCI)	(14,134)	(19,711)	(36,892)	(87,342)
Credit-related impairment loss, net of recoveries	8,137	(76,049)	(55,012)	(155,960)
Balance, end of period	$ 752,464	$ 874,852	$ 752,464	$ 874,852