cm:Level2TextBlock: us-gaap:EmployeeStockOwnershipPlanESOPPolicy
| Employee Stock Ownership Plan (ESOP), Policy [Policy Text Block] |
| us-gaap:EmployeeStockOwnershipPlanESOPPolicy |
| Disclosure of accounting policy for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt new guidance and new ESOP shares for which new guidance is required, these disclosures are required for both blocks of shares. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EmployeeStockOwnershipPlanESOPPolicy |