cm:Concept: us-gaap:RepurchaseAgreementCounterpartyAmountAtRisk
| Repurchase Agreement Counterparty, Amount at Risk |
| us-gaap:RepurchaseAgreementCounterpartyAmountAtRisk |
| The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest). |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:RepurchaseAgreementCounterpartyAmountAtRisk |