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Guarantees - Credit recourse - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Guarantee on loans sold or serviced with credit recourse
Guarantor Obligations
Valuation allowances and reserves balance	$ 11,800,000	$ 22,484,000	$ 34,862,000
Serviced mortgage loans
Guarantor Obligations
Loans serviced	12,100,000,000	12,900,000,000
Loans with recourse
Guarantor Obligations
Loans serviced	700,000,000	900,000,000
Loans with recourse | Serviced mortgage loans
Guarantor Obligations
Repurchased loans	19,000,000	161,000,000
Loans with recourse | Serviced mortgage loans | Bulk loan repurchase
Guarantor Obligations
Repurchased loans		120,000,000
Credit recourse reserve		(5,100,000)
Securitization | Guarantee on loans sold or serviced with representation and warranties
Guarantor Obligations
Repurchased loans	$ 0	$ 0

X

- Definition

Credit recourse reserve.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

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- Definition

Unpaid principal amount of loans repurchased.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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(Column B))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

Reference 2: 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(Column E))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

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