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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Variable Interest Entity [Line Items] |  |  |
Primary beneficiary, maximum loss exposure, amount | $ 18,400 |  |
Total residential whole loans | 8,800,000 |  | $ 8,800,000
Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds from issuance of debt | 8,857,447 |  | 8,574,069
Residential whole loans transferred to consolidated VIEs | 7,000,000 |  | 6,900,000
Securitized debt | 5,900,000 |  | 5,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets |  |  |
Variable Interest Entity [Line Items] |  |  |
Real estate owned at fair value | 30,700 |  | $ 26,900
Asset-backed Securities, Securitized Loans and Receivables | Senior Bonds |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds from issuance of debt | 283,400 | $ 160,000 |
Proceed from debt net of offering expenses and underwriting discount | $ 283,400 | $ 160,000 |

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