cm:Member: us-gaap:FairValueConcentrationOfRiskMarketRiskManagementGapAnalysisMember
| Fair Value, Concentration of Risk, Market Risk Management, Gap Analysis [Member] |
| us-gaap:FairValueConcentrationOfRiskMarketRiskManagementGapAnalysisMember |
| This item represents the encouraged disclosure to provide a gap analysis of the affect that interest rate re-pricing or changing maturity dates may have on the associated financial instrument (as defined), in a manner that is consistent with the way the Company manages or adjusts for those risks. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:FairValueConcentrationOfRiskMarketRiskManagementGapAnalysisMember |