cm:Concept: us-gaap:DepositAssetsEffectOfChangeInPresentValueAssumptionsResultingInAdditionsToExpectedRecoveries
Deposit Assets, Effect of Change in Present Value Assumptions Resulting in Additions to Expected Recoveries |
us-gaap:DepositAssetsEffectOfChangeInPresentValueAssumptionsResultingInAdditionsToExpectedRecoveries |
Amount of decrease in expense due to change in present value assumptions used to value deposit assets. |
cm:Concept |
Monetary (xbrli:monetaryItemType) |
For Period (duration) |
Credit |
false |
us-gaap:DepositAssetsEffectOfChangeInPresentValueAssumptionsResultingInAdditionsToExpectedRecoveries |