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cm:Concept: us-gaap:AociDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossCumulativeGainLossAfterTax
Standard label: AOCI, Debt Securities, Available-for-sale without Allowance for Credit Loss, Cumulative Gain (Loss), after Tax
Name: us-gaap:AociDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossCumulativeGainLossAfterTax
Documentation: Amount, after tax, of accumulated 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) without allowance for credit loss.
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:AociDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossCumulativeGainLossAfterTax

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Labels
Label Role Language
AOCI, Debt Securities, Available-for-sale without Allowance for Credit Loss, Cumulative Gain (Loss), after Tax http://www.xbrl.org/2003/role/label en-US
AOCI, Debt Securities, Available-for-sale without Allowance for Credit Loss, Cumulative Gain (Loss), after Tax, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 326 30 45 2 http://www.xbrl.org/2003/role/disclosureRef 326