| Standard label: | Nature of Operations [Text Block] |
| Name: | us-gaap:NatureOfOperations |
| Documentation: | The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. |
| Object type: | cm:Level1TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:NatureOfOperations |
| Examples of this text block disclosure: | NatureOfOperations |
| Label | Role | Language |
| Nature of Operations [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 275 | http://www.xbrl.org/2003/role/disclosureRef | 275 |
| FASB Accounting Standards Codification 275 10 50 1 (a) | http://www.xbrl.org/2003/role/disclosureRef | 275 |