cm:Concept: us-gaap:LoansReceivableBasisSpreadOnVariableRateDuringPeriod
| Loans Receivable, Basis Spread on Variable Rate, During Period |
| us-gaap:LoansReceivableBasisSpreadOnVariableRateDuringPeriod |
| The percentage points added to the reference rate or index during the adjustment period to compute the variable [fully indexed] rate on the loans receivable realized during the reporting period. This may be an effective margin for the period depending on the specific terms of the underlying loan agreement (for example, an annual disclosure for a loan with a quarterly adjustment period). |
| cm:Concept |
| Percent (num:percentItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LoansReceivableBasisSpreadOnVariableRateDuringPeriod |