Loans Held for Investment - Changes in Carrying Value of Securitized Loans Held For Investment Carried at Fair Value (Details) - Variable Interest Entities, Primary Beneficiary - Loans held for investment, at fair value - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning of period	$ 11,196,678	$ 11,397,046
Purchases	38,470	1,062,699
Principal paydowns	(347,749)	(1,309,843)
Sales and settlements	(53,090)	(116,652)
Net periodic accretion (amortization)	(2,399)	(39,236)
Change in fair value	151,930	202,664
Balance, end of period	$ 10,983,840	$ 11,196,678