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Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	$ 25,401	$ 21,793
Freddie Mac SLST(1)
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	4,630	5,656
Freddie Mac K-Series
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	1,190	1,177
CAFL(1)
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	11,030	10,122
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	99	141
Asset-backed securities issued | Sequoia
Debt Instrument [Line Items]
Amortization of deferred ABS issuance costs	$ 8,452	$ 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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-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
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-SubTopic 20
-Section 50
-Paragraph 1F
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-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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