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Guarantees - Credit recourse - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Guarantee on loans sold or serviced with credit recourse |  |  |  |  |  |  |  |
Guarantor Obligations |  |  |  |  |  |  |  |
Valuation allowances and reserves balance | $ 12,651,000 | $ 26,885,000 | $ 12,651,000 | $ 26,885,000 | $ 15,662,000 | $ 22,484,000 | $ 31,305,000 | $ 34,862,000
Serviced mortgage loans |  |  |  |  |  |  |  |
Guarantor Obligations |  |  |  |  |  |  |  |
Loans serviced | 12,300,000,000 |  | 12,300,000,000 |  |  | 12,900,000,000 |  |
Loans with recourse |  |  |  |  |  |  |  |
Guarantor Obligations |  |  |  |  |  |  |  |
Loans serviced | 800,000,000 |  | 800,000,000 |  |  | $ 900,000,000 |  |
Loans with recourse | Serviced mortgage loans |  |  |  |  |  |  |  |
Guarantor Obligations |  |  |  |  |  |  |  |
Repurchased loans | 2,000,000 | 131,000,000 | 17,000,000 | 143,000,000 |  |  |  |
Loans with recourse | Serviced mortgage loans | Bulk loan repurchase | Loans from FNMA and FHLMC |  |  |  |  |  |  |  |
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 | $ 0 | $ 0 |  |  |  |

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- 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 + Details
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- 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. + Details
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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 + Details
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