| Standard label: | Unearned Premiums |
| Name: | us-gaap:UnearnedPremiums |
| Documentation: | Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UnearnedPremiums |
| Label | Role | Language |
| Unearned Premiums | http://www.xbrl.org/2003/role/label | en-US |
| Unearned Premiums, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03(a)(13)(a)(2)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |