cm:Concept: us-gaap:ExcessTangibleCapitalRequiredForCapitalAdequacyToTangibleAssets
| Excess Tangible Capital Required for Capital Adequacy to Tangible Assets |
| us-gaap:ExcessTangibleCapitalRequiredForCapitalAdequacyToTangibleAssets |
| The amount of excess Tangible Capital, which generally includes outstanding stock plus retained earnings, divided by tangible assets (assets with physical existence) as defined in the regulations. |
| cm:Concept |
| Percent (num:percentItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:ExcessTangibleCapitalRequiredForCapitalAdequacyToTangibleAssets |