cm:Concept: us-gaap:CertainLoansAcquiredInTransferNonaccretableDifference
| Certain Loans Acquired in Transfer, Nonaccretable Difference |
| us-gaap:CertainLoansAcquiredInTransferNonaccretableDifference |
| The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. 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) |
| Credit |
| false |
| us-gaap:CertainLoansAcquiredInTransferNonaccretableDifference |