| Standard label: | Premiums Earned, Net |
| Name: | us-gaap:PremiumsEarnedNet |
| Documentation: | Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. |
| 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:PremiumsEarnedNet |
| Label | Role | Language |
| Premiums Earned, Net | http://www.xbrl.org/2003/role/label | en-US |
| Premiums Earned, Net, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04(13)(c)) | http://www.xbrl.org/2003/role/disclosureRef | 942 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(1)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 235 S99 2 (SX 210.12-17(Column E)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 605 50 1 (c)(3) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| Part Of Roll Up: |
| us-gaap:Revenues |