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cm:Concept: us-gaap:DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax
Standard label: Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Name: us-gaap:DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax
Documentation: Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: As Of (instant)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax

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Labels
Label Role Language
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax http://www.xbrl.org/2003/role/label en-US
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic