cm:Concept: us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
| Capital Required to be Well Capitalized to Risk Weighted Assets |
| us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |
| The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. |
| cm:Concept |
| Percent (num:percentItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |