cm:Concept: us-gaap:InterestReceivableCurrent
| Interest Receivable, Current |
| us-gaap:InterestReceivableCurrent |
| Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:InterestReceivableCurrent |