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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
entity
Jun. 30, 2024
USD ($)
entity
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]          
Number of SPE liquidated | entity 1 1      
Total residential whole loans $ 9,000,000     $ 9,000,000 $ 9,000,000
Asset-backed Securities, Securitized Loans and Receivables          
Variable Interest Entity [Line Items]          
Proceeds from issuance of debt     $ 7,089,575 7,827,356  
Residential whole loans transferred to consolidated VIEs 6,300,000     6,300,000 5,700,000
Securitized debt 5,300,000     5,300,000 4,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets          
Variable Interest Entity [Line Items]          
Real estate owned at fair value 9,600     9,600 $ 33,300
Asset-backed Securities, Securitized Loans and Receivables | Senior Bonds          
Variable Interest Entity [Line Items]          
Proceeds from issuance of debt 579,500     1,200,000  
Proceed from debt net of offering expenses and underwriting discount 561,400     $ 1,200,000  
Repayments of debt $ 176,300 $ 68,100