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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	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 5,992,049	$ 1,259,774
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,822,009	1,252,879
Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,144,598
Restricted cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,168	151
Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	20,331	3,391
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,943	3,353
Legacy Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	524,869	637,184
Legacy Sequoia | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	519,958	632,817
Legacy Sequoia | Multifamily loans
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	146	147
Legacy Sequoia | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	822	867
Legacy Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,943	3,353
Sequoia Choice
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,089,392	622,590
Sequoia Choice | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,079,382	620,062
Sequoia Choice | Multifamily 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	1,022	4
Sequoia Choice | Accrued interest receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	8,988	2,524
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	1,226,595	0
Freddie Mac SLST | Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,222,669	0
Freddie Mac SLST | Multifamily loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	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	3,926	0
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	2,151,193	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
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	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	6,595	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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