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cm:Concept: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment
Standard label: Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment
Name: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment
Documentation: Amount of unrealized gain (loss) recognized in earnings from investment in debt and equity securities measured at fair value with change in fair value recognized in net income, and recognized from transfer of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at amortized cost (held-to-maturity) to investment in debt security measured at fair value with change in fair value recognized in net income (trading). Excludes other-than-temporary impairment (OTTI).
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment

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Labels
Label Role Language
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment http://www.xbrl.org/2003/role/label en-US
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic

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Roll Up Relations
Part Of Roll Up:
us-gaap:DebtAndEquitySecuritiesGainLossExcludingOtherThanTemporaryImpairmentLoss