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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | $ 41,293 | $ 143,416 | $ 129,284 | $ 148,333
Residential whole loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 41,293 | 143,416 | 129,284 | 148,333
Residential whole loans | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 31,465 | 94,489 | 104,783 | 124,058
Residential whole loans | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | 7,169 | 26,679 | 19,985 | 13,092
Residential whole loans | 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 | 16,878 | 39,662 | 45,888 | 57,269
Residential whole loans | 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 | (1,770) | 2,401 | (16,488) | (1,720)
Residential whole loans | 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 | (7,939) | (15,384) | (9,415) | (42,457)
Residential whole loans | 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 | 1,769 | 18,923 | 1,885 | 9,002
Residential whole loans | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain/(loss) on residential whole loans measured at fair value through earnings | $ 890 | $ 3,325 | $ 2,631 | $ 2,181

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