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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 20,711	$ 21,793
Freddie Mac SLST
Debt Instrument [Line Items]
Amortization of debt issuance costs	5,461	5,656
Freddie Mac K-Series
Debt Instrument [Line Items]
Amortization of debt issuance costs	1,208	1,177
CAFL
Debt Instrument [Line Items]
Amortization of debt issuance costs	10,256	10,122
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Amortization of debt issuance costs	128	141
Asset-backed securities issued | Sequoia Choice
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 3,658	$ 4,697

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=121586364&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=120395209&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=119993939&loc=d3e28555-108399

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