cm:Level1TextBlock: us-gaap:RestrictedAssetsDisclosureTextBlock
| Restricted Assets Disclosure [Text Block] |
| us-gaap:RestrictedAssetsDisclosureTextBlock |
| The entire disclosure for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RestrictedAssetsDisclosureTextBlock |
| RestrictedAssetsDisclosure |