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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - Asset-backed securities issued - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | $ 22,905 | $ 21,793
Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | 107 | 141
Sequoia |  |
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | 5,918 | 4,697
CAFL |  |
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | 10,760 | 10,122
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | 4,925 | 5,656
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Total Accrued Interest Payable on ABS Issued | $ 1,195 | $ 1,177

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