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Asset-Backed Securities Issued - Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 1,647,850 | $ 1,259,774
Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,639,770 | 1,252,879
Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 155 | 151
Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,810 | 3,391
REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 3,115 | 3,353
Legacy Sequoia |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 630,167 | 637,184
Legacy Sequoia | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 626,151 | 632,817
Legacy Sequoia | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 148 | 147
Legacy Sequoia | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 753 | 867
Legacy Sequoia | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 3,115 | 3,353
Sequoia Choice |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,017,683 | 622,590
Sequoia Choice | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,013,619 | 620,062
Sequoia Choice | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 7 | 4
Sequoia Choice | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,057 | 2,524
Sequoia Choice | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 0 | $ 0

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- Definition The carrying value of collateral as of the balance sheet date for the asset-backed securities issued. + References No definition available. + Details
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