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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
entity
Jun. 30, 2024
USD ($)
entity
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Variable Interest Entity [Line Items]            
Number of SPE liquidated | entity   1 1      
Primary beneficiary, maximum loss exposure, amount $ 18,900     $ 18,900    
Total residential whole loans 8,800,000     8,800,000   $ 8,800,000
Asset-backed Securities, Securitized Loans and Receivables            
Variable Interest Entity [Line Items]            
Proceeds from issuance of debt       9,821,597   8,574,069
Residential whole loans transferred to consolidated VIEs 7,600,000     7,600,000   6,900,000
Securitized debt 6,400,000     6,400,000   5,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets            
Variable Interest Entity [Line Items]            
Real estate owned at fair value 48,500     48,500   $ 26,900
Asset-backed Securities, Securitized Loans and Receivables | Senior Bonds            
Variable Interest Entity [Line Items]            
Proceeds from issuance of debt 672,800 $ 579,500   1,200,000 $ 1,200,000  
Proceed from debt net of offering expenses and underwriting discount $ 672,800 561,400   $ 1,200,000 $ 1,200,000  
Repayments of debt   $ 176,300 $ 68,100