LOANS - Investment Loan Activity (Details) $ in Thousands	6 Months Ended
	Jun. 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	5,987,132
Sales and transfers	(5,729,881)
Principal payments	(64,526)
Gains / (losses)	10,431
(Amortization) / accretion	(8,012)
Ending balance June 30, 2024	2,548,228	[2]
Transfer of residential loans to securitization vehicles, carrying value	$ 5,600,000

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

[2] (4)Includes $3.9 million and $1.2 million of residential mortgage loans held for sale at June 30, 2024 and December 31, 2023, respectively.