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cm:Level3TextBlock: us-gaap:ScheduleOfSecuritiesOwnedAndSoldNotYetPurchasedAtFairValueTextBlock
Standard label: Schedule of Securities Owned and Sold, Not yet Purchased, at Fair Value [Table Text Block]
Name: us-gaap:ScheduleOfSecuritiesOwnedAndSoldNotYetPurchasedAtFairValueTextBlock
Documentation: Tabular disclosure of financial instruments held by a broker-dealer for its own account (proprietary securities) for trading or investment purposes that are carried at fair value including securities sold, not yet purchased.
Object type: cm:Level3TextBlock
Data type: Text Block (HTML) (nonnum:textBlockItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:ScheduleOfSecuritiesOwnedAndSoldNotYetPurchasedAtFairValueTextBlock

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Labels
Label Role Language
Schedule of Securities Owned and Sold, Not yet Purchased, at Fair Value [Table Text Block] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 940 320 45 2 http://fasb.org/us-gaap/role/ref/legacyRef 940