| Standard label: | Condensed Financial Information of Parent Company Only Disclosure [Text Block] |
| Name: | us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock |
| Documentation: | The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. |
| 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:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock |
| Label | Role | Language |
| Condensed Financial Information of Parent Company Only Disclosure [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 S99 3 (SX 210.12-04) | http://www.xbrl.org/2003/role/disclosureRef | 235 |
| FASB Accounting Standards Codification 810 10 45 11 | http://www.xbrl.org/2003/role/recommendedDisclosureRef | 810 |