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Short-Term Debt - Collateral for Short-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Short-term Debt [Line Items] |  |
Total real estate securities owned | $ 114,553 | $ 1,491,986
Other assets | 315 | 16,252
Total Collateral for Short-Term Debt | 398,252 | 2,698,366
On balance sheet |  |
Short-term Debt [Line Items] |  |
On balance sheet | 23,193 | 618,881
Sequoia Choice | Sequoia securities | Short Term Borrowing Agreement |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 63,105 | 111,341
Freddie Mac SLST | Sequoia securities | Short Term Borrowing Agreement |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 0 | 381,640
Freddie Mac K-Series | Sequoia securities | Short Term Borrowing Agreement |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 28,255 | 252,284
CAFL | Sequoia securities | Short Term Borrowing Agreement |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 0 | 127,840
Cash Collateral |  |
Short-term Debt [Line Items] |  |
Other assets | 300 |
Residential loans, held-for-sale, at fair value |  |
Short-term Debt [Line Items] |  |
Loan pledged as collateral | 156,355 | 201,949
Business Purpose Loans |  |
Short-term Debt [Line Items] |  |
Loan pledged as collateral | $ 127,029 | $ 988,179

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524 + Details
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