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cm:Concept: us-gaap:OtherComprehensiveLossHeldToMaturitySecurityAdjustmentFromAociForAccretionOfNoncreditPortionOfOttiBeforeTax
Standard label: Other Comprehensive Loss, Held-to-maturity Security, Adjustment from AOCI for Accretion of Noncredit Portion of OTTI, before Tax
Name: us-gaap:OtherComprehensiveLossHeldToMaturitySecurityAdjustmentFromAociForAccretionOfNoncreditPortionOfOttiBeforeTax
Documentation: Amount, before tax, of adjustment from accumulated other comprehensive loss for accretion of other than temporary impairment (OTTI) on investment in held-to-maturity security.
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:OtherComprehensiveLossHeldToMaturitySecurityAdjustmentFromAociForAccretionOfNoncreditPortionOfOttiBeforeTax

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Labels
Label Role Language
Other Comprehensive Loss, Held-to-maturity Security, Adjustment from AOCI for Accretion of Noncredit Portion of OTTI, before Tax http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 14A http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 320 10 35 35A http://fasb.org/us-gaap/role/ref/legacyRef 320