cm:Concept: us-gaap:StatutoryAccountingPracticesDescriptionOfPrescribedPractice
| Statutory Accounting Practices, Description of Prescribed Practice |
| us-gaap:StatutoryAccountingPracticesDescriptionOfPrescribedPractice |
| Description of items listed to reconcile the differences as of the balance sheet date resulting from applying state prescribed statutory accounting practices rather than statutory accounting practices prescribed by National Association of Insurance Commissioners. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:StatutoryAccountingPracticesDescriptionOfPrescribedPractice |