cm:Concept: us-gaap:CertainLoansAcquiredInTransferAccretableYield
| Certain Loans Acquired in Transfer, Accretable Yield |
| us-gaap:CertainLoansAcquiredInTransferAccretableYield |
| The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating 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:CertainLoansAcquiredInTransferAccretableYield |