| Standard label: | Payments for Origination and Purchases of Loans Held-for-sale |
| Name: | us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale |
| Documentation: | The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale |
| Label | Role | Language |
| Payments for Origination and Purchases of Loans Held-for-sale | http://www.xbrl.org/2003/role/label | en-US |
| Payments for Origination and Purchases of Loans Held-for-sale, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 21 | http://www.xbrl.org/2003/role/disclosureRef | 230 |
| Part Of Roll Up: |
| us-gaap:IncreaseDecreaseInLoansHeldForSale |