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Long-Term Debt - Schedule of Collateral for Long-Term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Collateral amounts | $ 1,175,479 | $ 1,084,929
Bridge Loan |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 373,597 | 544,151
Residential Real Estate |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 298,014 | 154,774
Commercial Real Estate |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 503,868 | 363,490
Commercial Real Estate | Sequoia | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 246,892 | 249,446
Commercial Real Estate | Facility A | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 256,976 | 114,044
Other Business Purpose Loan Investments |  |
Debt Instrument [Line Items] |  |
Collateral amounts | 0 | 21,414
Restricted cash |  |
Debt Instrument [Line Items] |  |
Collateral amounts | $ 0 | $ 1,100

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
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