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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, 2024 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |
Total residential whole loans | $ 9,100,000 | $ 9,000,000
Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Proceeds from issuance of debt | 7,249,574 | 7,089,575
Residential whole loans transferred to consolidated VIEs | 5,700,000 | 5,700,000
Securitized debt | 4,800,000 | 4,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Real estate owned at fair value | 31,900 | $ 33,300
Senior Bonds |  |
Variable Interest Entity [Line Items] |  |
Proceeds from issuance of debt | 160,000 |
Proceed from debt net of offering expenses and underwriting discount | $ 160,000 |

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