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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
Sep. 30, 2025
Dec. 31, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal $ 4,454,599 $ 4,129,335
Premium / (Discount) (89,987) (74,755)
Change in fair value (107,929) (212,842)
Carrying value 4,256,683 3,841,738
Consolidated SLST | VIE, Primary Beneficiary    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal 1,329,199 1,111,633
Premium / (Discount) (62,042) (24,303)
Change in fair value (84,558) (121,658)
Carrying value 1,182,599 965,672
Residential loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal 315,228 652,642
Premium / (Discount) 270 (1,750)
Change in fair value (7,076) (18,626)
Carrying value 308,422 632,266
Residential loans held in securitization trusts    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal 2,707,733 2,365,060
Premium / (Discount) (28,215) (48,702)
Change in fair value (18,892) (72,558)
Carrying value 2,660,626 $ 2,243,800
Total Residential loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal 4,352,160  
Premium / (Discount) (89,987)  
Change in fair value (110,526)  
Carrying value 4,151,647  
Residential loans held for sale    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Principal 102,439  
Premium / (Discount) 0  
Change in fair value 2,597  
Carrying value $ 105,036