cm:Concept: us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement
| Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement |
| us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement |
| Amount 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, not subject to a master netting arrangement. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement |