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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, 2019	Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 7,616,278	$ 5,992,049
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,840,195	3,822,009
Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,749,657	2,144,598
Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	158	1,168
Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	24,820	20,331
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,448	3,943
Legacy Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	460,113	524,869
Legacy Sequoia | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	457,750	519,958
Legacy Sequoia | Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Legacy Sequoia | Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	144	146
Legacy Sequoia | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	771	822
Legacy Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,448	3,943
Sequoia Choice
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,156,316	2,089,392
Sequoia Choice | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,147,356	2,079,382
Sequoia Choice | Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Sequoia Choice | Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	14	1,022
Sequoia Choice | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	8,946	8,988
Sequoia Choice | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Freddie Mac SLST
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,238,875	1,226,595
Freddie Mac SLST | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,235,089	1,222,669
Freddie Mac SLST | Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Freddie Mac SLST | Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Freddie Mac SLST | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,786	3,926
Freddie Mac SLST | 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	3,760,974	2,151,193
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
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,749,657	2,144,598
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	11,317	6,595
Freddie Mac K-Series | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 0	$ 0

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

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