| Standard label: | Earnings Per Share [Text Block] |
| Name: | us-gaap:EarningsPerShareTextBlock |
| Documentation: | The entire disclosure for earnings per share. |
| 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:EarningsPerShareTextBlock |
| Examples of this text block disclosure: | EarningsPerShareDisclosures |
| Label | Role | Language |
| Earnings Per Share [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 260 | http://fasb.org/us-gaap/role/ref/legacyRef | 260 |