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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans - 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] |  |  |  |
Interest income | $ 153,290 | $ 157,406 | $ 459,168 | $ 480,788
Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 76,742 | 58,467 | 212,273 | 173,077
Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 55,983 | 78,298 | 186,933 | 241,714
Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 21,636 | 26,333 | 65,780 | 80,999
Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 18,991 | 28,486 | 68,535 | 86,746
Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 15,356 | 23,479 | 52,618 | 73,969
Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 20,086 | 20,139 | 58,541 | 64,453
Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 479 | 502 | 1,421 | 1,544
Held at Carrying Value |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 17,976 | 20,654 | 59,216 | 64,767
Held at Carrying Value | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 8,649 | 10,357 | 28,069 | 33,306
Held at Carrying Value | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 1,950 | 2,534 | 9,471 | 7,765
Held at Carrying Value | Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 1,740 | 2,285 | 5,433 | 7,123
Held at Carrying Value | Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 210 | 249 | 4,038 | 642
Held at Carrying Value | Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 0 | 0 | 0 | 0
Held at Carrying Value | Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 7,377 | 7,763 | 21,676 | 23,696
Held at Carrying Value | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 0 | 0 | 0 | 0
Held at Fair Value |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 135,314 | 136,752 | 399,952 | 416,021
Held at Fair Value | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 68,093 | 48,110 | 184,204 | 139,771
Held at Fair Value | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 54,033 | 75,764 | 177,462 | 233,949
Held at Fair Value | Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 19,896 | 24,048 | 60,347 | 73,876
Held at Fair Value | Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 18,781 | 28,237 | 64,497 | 86,104
Held at Fair Value | Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 15,356 | 23,479 | 52,618 | 73,969
Held at Fair Value | Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 12,709 | 12,376 | 36,865 | 40,757
Held at Fair Value | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | $ 479 | $ 502 | $ 1,421 | $ 1,544

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