| Standard label: | Premiums Written, Gross |
| Name: | us-gaap:PremiumsWrittenGross |
| Documentation: | Amount of direct and assumed premiums written. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PremiumsWrittenGross |
| Label | Role | Language |
| Premiums Written, Gross | http://www.xbrl.org/2003/role/label | en-US |
| Premiums Written, Gross, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 605 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |