LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ 1,469,152	$ 1,733,793	$ 1,330,513
Total included in net income (loss)	1,725,325	2,389,896	$ (891,163)
Residential mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	410,195	182,325
Net gains (losses) on disposal of investments	(12,842)	(37,212)
Net unrealized gains (losses) on instruments measured at fair value through earnings	(1,420,645)	19,545
Total included in net income (loss)	$ (1,023,292)	$ 164,658