| Standard label: | Summary of Income Tax Examinations [Table Text Block] |
| Name: | us-gaap:SummaryOfIncomeTaxExaminationsTextBlock |
| Documentation: | Tabular disclosure of income tax examinations that an enterprise is currently subject to or that have been completed in the current period typically including a description of the examination, the jurisdiction conducting the examination, the tax year(s) under examination, the likelihood of an unfavorable settlement, the range of possible losses, the liability recorded, the increase or decrease in the liability from the prior period, and any penalties and interest that have been recorded. |
| Object type: | cm:Level3TextBlock |
| 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:SummaryOfIncomeTaxExaminationsTextBlock |
| Examples of this text block disclosure: | IncomeTaxExamination |
| Label | Role | Language |
| Summary of Income Tax Examinations [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 740 10 50 15 | http://fasb.org/us-gaap/role/ref/legacyRef | 740 |
| FASB Accounting Standards Codification 740 10 55 217 | http://fasb.org/us-gaap/role/ref/legacyRef | 740 |