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	Mar. 31, 2026	Dec. 31, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	$ 4,816,314	$ 4,619,015
Premium / (Discount)	(80,302)	(85,324)
Change in fair value	(116,378)	(94,809)
Carrying value	4,619,634	4,438,882
Consolidated SLST \| VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,286,462	1,307,770
Premium / (Discount)	(60,995)	(61,606)
Change in fair value	(87,400)	(80,487)
Carrying value	1,138,067	1,165,677
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	764,263	575,565
Premium / (Discount)	3,457	3,389
Change in fair value	(6,469)	5,009
Carrying value	761,251	583,963
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	2,646,721	2,656,765
Premium / (Discount)	(22,764)	(27,107)
Change in fair value	(25,248)	(21,123)
Carrying value	2,598,709	2,608,535
Total Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	4,697,446	4,540,100
Premium / (Discount)	(80,302)	(85,324)
Change in fair value	(119,117)	(96,601)
Carrying value	4,498,027	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	118,868	78,915
Premium / (Discount)	0	0
Change in fair value	2,739	1,792
Carrying value	$ 121,607	$ 80,707