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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 25,708	$ 16,897
Freddie Mac SLST
Debt Instrument [Line Items]
Amortization of debt issuance costs	5,498	2,907
Freddie Mac K-Series
Debt Instrument [Line Items]
Amortization of debt issuance costs	10,805	6,239
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Amortization of debt issuance costs	456	571
Asset-backed securities issued | Sequoia Choice
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 8,949	$ 7,180

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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