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Residential Whole Loans - Realized Credit Losses Net of Recoveries (Details) - Residential whole loan - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | $ (7,084) | $ (469) | $ (9,077) | $ 214
Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | (2,393) | 362 | (2,012) | 1,461
Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | (3,802) | 0 | (3,910) | 0
Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | (669) | (212) | (2,123) | 246
Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | 0 | 11 | 88 | 872
Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | (220) | (630) | (1,120) | (2,365)
Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Realized credit losses, net of recoveries | $ 0 | $ 0 | $ 0 | $ 0

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