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cm:Concept: us-gaap:HeldtomaturitySecuritiesSoldSecurityRealizedGainLossExcludingOtherThanTemporaryImpairments
Standard label: Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss), Excluding Other-than-temporary Impairment
Name: us-gaap:HeldtomaturitySecuritiesSoldSecurityRealizedGainLossExcludingOtherThanTemporaryImpairments
Documentation: Amount of gain (loss) on sale of investment in debt security measured at amortized cost (held-to-maturity), excluding 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:HeldtomaturitySecuritiesSoldSecurityRealizedGainLossExcludingOtherThanTemporaryImpairments

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

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References
Reference Role Topic
FASB Accounting Standards Codification 230 10 45 28 (b) http://www.xbrl.org/2003/role/recommendedDisclosureRef 230
FASB Accounting Standards Codification 320 10 50 10 (c) http://www.xbrl.org/2003/role/disclosureRef 320

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