LOANS - Investment Loan Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2024	$ 2,353,084	[1]
Purchases / originations	13,289,226
Sales and transfers	(11,901,699)
Principal payments	(148,631)
Gains / (losses)	(28,011)
(Amortization) / accretion	(17,067)
Ending balance December 31, 2024	3,546,902	[1]
Transfer of residential loans to securitization vehicles, carrying value, noncash	$ 11,200,000

[1] (3) Includes $10.0 million and $1.2 million of residential mortgage loans held for sale at December 31, 2024 and 2023, respectively.