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Short-Term Debt - Collateral for Short-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Short-term Debt [Line Items] |  |
Total Collateral for Short-Term Debt Facilities | $ 2,450,304 | $ 649,106
Line of Credit |  |
Short-term Debt [Line Items] |  |
Total real estate securities owned | 99,005 | 114,553
Other assets | 1,962 | 315
Total Collateral for Short-Term Debt Facilities | 2,107,451 | 398,252
Servicer advance financing |  |
Short-term Debt [Line Items] |  |
Total Collateral for Short-Term Debt Facilities | 342,853 | 250,854
Cash Collateral for Borrowed Securities | 6,480 | 9,978
Restricted Cash Collateral For Borrowed Securities | 25,420 | 23,220
Servicer Advances Collateral | 310,953 | 217,656
On balance sheet | Line of Credit |  |
Short-term Debt [Line Items] |  |
On balance sheet | 5,823 | 23,193
Sequoia | Sequoia securities | Short Term Borrowing Agreement | Line of Credit |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 61,525 | 63,105
Freddie Mac K-Series | Sequoia securities | Short Term Borrowing Agreement | Line of Credit |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 31,657 | 28,255
Residential loans, held-for-sale, at fair value | Line of Credit |  |
Short-term Debt [Line Items] |  |
Loan pledged as collateral | 1,838,797 | 156,355
Business Purpose Loans | Line of Credit |  |
Short-term Debt [Line Items] |  |
Loan pledged as collateral | $ 167,687 | $ 127,029

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