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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Total residential whole loans $ 8,200,000 $ 8,200,000 $ 7,900,000
Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Proceeds from issuance of debt   5,762,491 3,682,082
Residential whole loans 4,400,000 4,400,000 3,000,000
Securitized debt 3,800,000 3,800,000 2,700,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets      
Variable Interest Entity [Line Items]      
Real estate owned at fair value 34,900 34,900 $ 35,400
Senior Bonds      
Variable Interest Entity [Line Items]      
Proceeds from issuance of debt 749,500 2,100,000  
Proceed from debt net of offering expenses and underwriting discount $ 722,000 $ 2,100,000