cm:Table: us-gaap:FairValueConcentrationOfRiskTable
| Fair Value, Concentration of Risk [Table] |
| us-gaap:FairValueConcentrationOfRiskTable |
| Summarization of information required and determined to be disclosed concerning all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. Such disclosure may also include quantitative information about the market risks of financial instruments that is consistent with the way the Company manages or adjusts those risks. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:FairValueConcentrationOfRiskTable |