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cm:Concept: us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Standard label: Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax
Name: us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Documentation: Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

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Labels
Label Role Language
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax http://www.xbrl.org/2003/role/label en-US
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (e) http://www.xbrl.org/2003/role/disclosureRef 220
FASB Accounting Standards Codification 220 10 45 10A (f) http://www.xbrl.org/2003/role/disclosureRef 220
FASB Accounting Standards Codification 220 10 45 11 http://www.xbrl.org/2003/role/disclosureRef 220

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