cm:Concept: us-gaap:HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |
us-gaap:HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions |
Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired. |
cm:Concept |
Decimal (xbrli:decimalItemType) |
As Of (instant) |
(no balance type) |
false |
us-gaap:HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions |