| Standard label: | Reinsurance [Text Block] |
| Name: | us-gaap:ReinsuranceTextBlock |
| Documentation: | The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts. |
| 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:ReinsuranceTextBlock |
| Label | Role | Language |
| Reinsurance [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |