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Residential Whole Loans - Interest Income Components (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] |  |  |  |
Interest income | $ 157,406 | $ 140,538 | $ 480,788 | $ 388,096
Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 78,298 | 64,310 | 241,714 | 169,614
Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 28,486 | 22,259 | 86,746 | 57,321
Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 23,479 | 17,964 | 73,969 | 43,750
Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 26,333 | 24,087 | 80,999 | 68,543
Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 58,467 | 51,724 | 173,077 | 141,330
Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 20,139 | 24,018 | 64,453 | 73,292
Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 502 | 486 | 1,544 | 3,860
Held at Carrying Value |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 20,654 | 23,582 | 64,767 | 72,340
Held at Carrying Value | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 2,534 | 2,840 | 7,765 | 9,837
Held at Carrying Value | Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 249 | 101 | 642 | 1,239
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 | Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 2,285 | 2,739 | 7,123 | 8,598
Held at Carrying Value | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 10,357 | 12,276 | 33,306 | 36,595
Held at Carrying Value | Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 7,763 | 8,466 | 23,696 | 25,908
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 | 136,752 | 116,956 | 416,021 | 315,756
Held at Fair Value | Business purpose loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 75,764 | 61,470 | 233,949 | 159,777
Held at Fair Value | Business purpose loans | Single-family transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 28,237 | 22,158 | 86,104 | 56,082
Held at Fair Value | Business purpose loans | Multifamily transitional loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 23,479 | 17,964 | 73,969 | 43,750
Held at Fair Value | Business purpose loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 24,048 | 21,348 | 73,876 | 59,945
Held at Fair Value | Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 48,110 | 39,448 | 139,771 | 104,735
Held at Fair Value | Legacy RPL/NPL loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | 12,376 | 15,552 | 40,757 | 47,384
Held at Fair Value | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income | $ 502 | $ 486 | $ 1,544 | $ 3,860

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