Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Residential Mortgage Loans Held in Securitization Trusts, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	$ 4,619,015	$ 4,129,335
Premium / (Discount)	(85,324)	(74,755)
Change in fair value	(94,809)	(212,842)
Carrying value	4,438,882	3,841,738	$ 3,084,303	$ 3,525,080
Consolidated SLST \| VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,307,770	1,111,633
Premium / (Discount)	(61,606)	(24,303)
Change in fair value	(80,487)	(121,658)
Carrying value	1,165,677	965,672
Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	575,565	652,642
Premium / (Discount)	3,389	(1,750)
Change in fair value	5,009	(18,626)
Carrying value	583,963	632,266
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	2,656,765	2,365,060
Premium / (Discount)	(27,107)	(48,702)
Change in fair value	(21,123)	(72,558)
Carrying value	2,608,535	$ 2,243,800
Total Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	4,540,100
Premium / (Discount)	(85,324)
Change in fair value	(96,601)
Carrying value	4,358,175
Residential loans held for sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	78,915
Premium / (Discount)	0
Change in fair value	1,792
Carrying value	$ 80,707