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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	Jun. 30, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 2,082,771	$ 1,259,774
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,073,174	1,252,879
Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	157	151
Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	6,791	3,391
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,649	3,353
Legacy Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	595,660	637,184
Legacy Sequoia | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	592,029	632,817
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	835	867
Legacy Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,649	3,353
Sequoia Choice
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,487,111	622,590
Sequoia Choice | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,481,145	620,062
Sequoia Choice | Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	10	4
Sequoia Choice | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	5,956	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.

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- Definition

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