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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | $ 33,686 | $ 16,897
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | 5,374 | 2,907
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | 12,887 | 6,239
CAFL |  |
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | 7,298 | 0
Asset-backed securities issued | Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | 395 | 571
Asset-backed securities issued | Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Amortization of deferred ABS issuance costs | $ 7,732 | $ 7,180

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