cm:Concept: us-gaap:ParticipatingMortgageLoansAppreciationInMarketValue
| Participating Mortgage Loans, Description of Terms |
| us-gaap:ParticipatingMortgageLoansAppreciationInMarketValue |
| Description of terms of mortgage that gives the lender the right to share in the appreciation of fair value or results of operations of the mortgaged real estate project. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ParticipatingMortgageLoansAppreciationInMarketValue |