cm:Member: us-gaap:UsGovernmentSponsoredEnterpriseInsuredLoansMember
| US Government Sponsored-Enterprise Insured Loans [Member] |
| us-gaap:UsGovernmentSponsoredEnterpriseInsuredLoansMember |
| Guarantee by US government-sponsored enterprises, including but not limited to, Federal National Mortgage Association (FNMA) or Federal Home Loan Mortgage Corporation (FHLMC) for government insured loans. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:UsGovernmentSponsoredEnterpriseInsuredLoansMember |