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Asset-Backed Securities Issued - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	$ 16,897	$ 2,568
Freddie Mac SLST
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	2,907	0
Freddie Mac K-Series
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	6,239	0
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	571	537
Asset-backed securities issued | Sequoia Choice
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	$ 7,180	$ 2,031
Contractual maturities of over five years | Asset-backed securities issued
Debt Instrument [Line Items]
Contractual maturities of ABS (in years)	5 years

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 220
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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