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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 |  |  |

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