cm:Concept: us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseGross
| Securities Sold under Agreements to Repurchase, Gross |
| us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseGross |
| Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseGross |