| Standard label: | Noninterest Income, Other |
| Name: | us-gaap:NoninterestIncomeOther |
| Documentation: | Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights. |
| 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:NoninterestIncomeOther |
| Label | Role | Language |
| Noninterest Income, Other | http://www.xbrl.org/2003/role/label | en-US |
| Noninterest Income, Other, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04.13) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |