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cm:Level3TextBlock: us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossTableTextBlock
Standard label: Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]
Name: us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossTableTextBlock
Documentation: Tabular disclosure of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).
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:DebtSecuritiesHeldToMaturityAllowanceForCreditLossTableTextBlock

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Labels
Label Role Language
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 326 20 50 13 http://www.xbrl.org/2009/role/commonPracticeRef 326