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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs | $ 25,708 | $ 16,897
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs | 5,498 | 2,907
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs | 10,805 | 6,239
Asset-backed securities issued | Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs | 456 | 571
Asset-backed securities issued | Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs | $ 8,949 | $ 7,180

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