LOANS - Investment Loan Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 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],[2]
Purchases / originations	9,329,964
Sales and transfers	(9,287,090)
Principal payments	(103,691)
Gains / (losses)	25,189
(Amortization) / accretion	(11,843)
Ending balance September 30, 2024	2,305,613	[2]
Transfer of residential loans to securitization vehicles, carrying value	$ 8,800,000

[1] (1)Derived from the audited consolidated financial statements at December 31, 2023.

[2] (4)Includes $0.8 million and $1.2 million of residential mortgage loans held for sale at September 30, 2024 and December 31, 2023, respectively.