| Standard label: | Basis of Accounting [Text Block] |
| Name: | us-gaap:BasisOfAccounting |
| Documentation: | The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). |
| 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:BasisOfAccounting |
| Examples of this text block disclosure: | BasisOfReporting |
| Label | Role | Language |
| Basis of Accounting [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |