cm:Concept: us-gaap:ProceedsFromUnsecuredLinesOfCredit
| Proceeds from Unsecured Lines of Credit |
| us-gaap:ProceedsFromUnsecuredLinesOfCredit |
| The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral). |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:ProceedsFromUnsecuredLinesOfCredit |