cm:Concept: us-gaap:GainLossOnSaleOfOtherLoansAndLeases
| Gain (Loss) on Sale of Other Loans and Leases |
| us-gaap:GainLossOnSaleOfOtherLoansAndLeases |
| The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of other loans and leases that were sold during the reporting period; excludes gains (losses) on sales of consumer and mortgage loans. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:GainLossOnSaleOfOtherLoansAndLeases |