cm:Concept: us-gaap:SharesHeldInEmployeeStockOptionPlanCommittedToBeReleased
| Shares Held in Employee Stock Option Plan, Committed-to-be-Released |
| us-gaap:SharesHeldInEmployeeStockOptionPlanCommittedToBeReleased |
| Number of committed-to-be-released shares held by the Employee Stock Option Plan at balance sheet date. Committed-to-be-released shares are shares that will be released in the future and will be allocated to employees for services rendered in an accounting period. These shares are legally released from suspense and from serving as collateral for ESOP debt as a result of payment of debt service. |
| cm:Concept |
| Shares (xbrli:sharesItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:SharesHeldInEmployeeStockOptionPlanCommittedToBeReleased |