cm:Concept: us-gaap:DemutualizationByInsuranceEntityNatureAndTerms
| Demutualization by Insurance Entity, Nature and Terms |
| us-gaap:DemutualizationByInsuranceEntityNatureAndTerms |
| Description of a demutualization by an insurance entity which might include the date; the plan of conversion or demutualization; description of the conversion from a mutual to a stock entity; the names of the entities involved including any changes in entity names, mergers or reorganizations; formation of a Mutual Insurance Holding Company (MIHC); policyholder compensation including an indication of the disposition of the membership interests (extinguished), a description of the consideration received by the policyholders (for example cash, stock and policy credits); the amount and nature of the costs of the demutualization, method of income recognition and presentation of assets and the establishment of a closed block. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DemutualizationByInsuranceEntityNatureAndTerms |