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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, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 995,768	$ 798,317
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	990,437	791,636
Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	147	148
Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,164	1,000
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,020	5,533
Legacy Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	677,199	798,317
Legacy Sequoia | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	673,134	791,636
Legacy Sequoia | Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	147	148
Legacy Sequoia | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	898	1,000
Legacy Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,020	5,533
Sequoia Choice
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 318,569	0
Sequoia Choice | Residential loans
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		0
Sequoia Choice | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued		0
Sequoia Choice | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued		$ 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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