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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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- Definition

The carrying value of collateral as of the balance sheet date for the asset-backed securities issued.

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