cm:Concept: us-gaap:AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements
| Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements |
| us-gaap:AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements |
| The amount of dividends that can be declared or paid without affecting the banking or savings institution's regulatory capital position. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements |