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Guarantees - Indemnification, Representations and Warranties related to loans sold - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Guarantor Obligations
Valuation Allowances And Reserves Balance	$ 22,000,000	$ 35,000,000
Securitization | Guarantee on loans sold or serviced with representation and warranties
Guarantor Obligations
Repurchased Loans	$ 0	$ 0

X

- Definition

Unpaid principal amount of loans repurchased.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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