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Residential Whole Loans - Net Gain/(Loss) on Residential Whole Loans Measured at Fair Value (Details) - 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] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | $ 143,416 | $ (132,894) | $ 148,333 | $ (134,423)
Residential whole loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 143,416 | (132,894) | 148,333 | (134,423)
Residential whole loan | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 26,679 | (35,676) | 13,092 | (35,096)
Residential whole loan | Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 2,401 | 688 | (1,720) | 1,085
Residential whole loan | Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | (15,384) | 2,550 | (42,457) | 4,624
Residential whole loan | Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 39,662 | (38,914) | 57,269 | (40,805)
Residential whole loan | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 94,489 | (78,560) | 124,058 | (76,832)
Residential whole loan | Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 18,923 | (15,426) | 9,002 | (19,928)
Residential whole loan | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | $ 3,325 | $ (3,232) | $ 2,181 | $ (2,567)

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