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Short-Term Debt - Collateral for Short-Term Debt Facilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Short-term Debt [Line Items] |  |
Total collateral for financing | $ 2,034,873 | $ 649,106
Facilities |  |
Short-term Debt [Line Items] |  |
Total real estate securities owned | 107,830 | 114,553
Other assets | 1,709 | 315
Total collateral for financing | 1,842,618 | 398,252
Servicer advance financing |  |
Short-term Debt [Line Items] |  |
Total collateral for financing | 192,255 | 250,854
Cash | 12,975 | 9,978
Restricted cash | 19,872 | 23,220
Servicer advances | 159,408 | 217,656
Held-for-sale residential loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 1,478,424 | 156,355
Business purpose loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 254,655 | 127,029
On balance sheet | Facilities |  |
Short-term Debt [Line Items] |  |
Available-for-sale securities pledged as collateral | 14,367 | 23,193
Sequoia | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 62,075 | 63,105
Freddie Mac K-Series | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | $ 31,388 | $ 28,255

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