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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - Asset-backed securities issued - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	$ 22,905	$ 21,793
Legacy Sequoia
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	107	141
Sequoia
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	5,918	4,697
CAFL
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	10,760	10,122
Freddie Mac SLST
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	4,925	5,656
Freddie Mac K-Series
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	$ 1,195	$ 1,177

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=123570139&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=123367319&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611

Reference 4: 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=124435984&loc=d3e28555-108399

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