| Standard label: | Interest and Fee Income, Loans and Leases Held-for-sale |
| Name: | us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldForSale |
| Documentation: | The amount of interest and fee income earned from loans held-for-sale, including mortgage loans, and interest earned from direct financing and sales-type leases held-for-sale. |
| 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:InterestAndFeeIncomeLoansAndLeasesHeldForSale |
| Label | Role | Language |
| Interest and Fee Income, Loans and Leases Held-for-sale | http://www.xbrl.org/2003/role/label | en-US |
| Interest and Fee Income, Loans and Leases Held-for-sale, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04.1) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |
| Part Of Roll Up: |
| us-gaap:InterestAndFeeIncomeLoansAndLeases |