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Short-Term Debt - Collateral for Short-Term Debt Facilities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Short-term Debt [Line Items] |  |
Total collateral for financing | $ 2,225,880 | $ 2,450,304
Facilities |  |
Short-term Debt [Line Items] |  |
Total real estate securities owned | 124,382 | 99,005
Other assets | 2,512 | 1,962
Total collateral for financing | 1,912,053 | 2,107,451
Servicer advance financing |  |
Short-term Debt [Line Items] |  |
Total collateral for financing | 313,827 | 342,853
Cash | 14,381 | 6,480
Restricted cash | 26,236 | 25,420
Servicer advances | 273,210 | 310,953
Held-for-sale residential loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 1,207,185 | 1,838,797
Business purpose loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 577,974 | 167,687
On balance sheet | Facilities |  |
Short-term Debt [Line Items] |  |
Available-for-sale securities pledged as collateral | 10,014 | 5,823
Sequoia | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 82,636 | 61,525
Freddie Mac K-Series | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | $ 31,732 | $ 31,657

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