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cm:Concept: us-gaap:DebtSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment
Standard label: Debt Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment
Name: us-gaap:DebtSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment
Documentation: Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and 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:DebtSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairment

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