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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 3,693,140 | $ 1,259,774
Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,735,153 | 1,252,879
Multifamily loans, held-for-investment, at fair value |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 942,165 |
Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 158 | 151
Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 12,749 | 3,391
REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,915 | 3,353
Legacy Sequoia |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 557,880 | 637,184
Legacy Sequoia | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 553,958 | 632,817
Legacy Sequoia | Multifamily loans, held-for-investment, at fair value |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Legacy Sequoia | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 147 | 147
Legacy Sequoia | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 860 | 867
Legacy Sequoia | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,915 | 3,353
Sequoia Choice |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,190,252 | 622,590
Sequoia Choice | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,181,195 | 620,062
Sequoia Choice | Multifamily loans, held-for-investment, at fair value |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 |
Sequoia Choice | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 11 | 4
Sequoia Choice | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 9,046 | 2,524
Sequoia Choice | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 945,008 | 0
Freddie Mac K-Series | Residential loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac K-Series | Multifamily loans, held-for-investment, at fair value |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 942,165 |
Freddie Mac K-Series | Restricted cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Freddie Mac K-Series | Accrued interest receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,843 | 0
Freddie Mac K-Series | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 0 | $ 0

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