cm:Concept: us-gaap:CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
| Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |
| us-gaap:CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet |
| The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet |