| Standard label: | Premiums Written, Net |
| Name: | us-gaap:PremiumsWrittenNet |
| Documentation: | Amount, after premiums ceded to other entities and premiums assumed by the entity, of 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:PremiumsWrittenNet |
| Label | Role | Language |
| Premiums Written, Net | http://www.xbrl.org/2003/role/label | en-US |
| Premiums Written, Net, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 605 50 1 (b)(1) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 605 50 1 (c)(1) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |