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cm:Concept: us-gaap:OtherComprehensiveLossHeldToMaturitySecurityOttiBeforeTaxAfterAdjustmentsAttributableToParent
Standard label: Other Comprehensive Loss, Held-to-maturity Security, OTTI, before Tax, after Adjustments, Attributable to Parent
Name: us-gaap:OtherComprehensiveLossHeldToMaturitySecurityOttiBeforeTaxAfterAdjustmentsAttributableToParent
Documentation: Amount, before tax, after adjustments, of increase (decrease) in other than temporary impairment (OTTI) on investment in held-to-maturity security, recognized in other comprehensive loss and attributable to parent.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:OtherComprehensiveLossHeldToMaturitySecurityOttiBeforeTaxAfterAdjustmentsAttributableToParent

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Labels
Label Role Language
Other Comprehensive Loss, Held-to-maturity Security, OTTI, before Tax, after Adjustments, Attributable to Parent http://www.xbrl.org/2003/role/label en-US
Other Comprehensive Loss, Held-to-maturity Security, OTTI, before Tax, after Adjustments, Attributable to Parent, 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 16A http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 45 10A (g) 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
FASB Accounting Standards Codification 810 10 50 1A (c)(3) http://fasb.org/us-gaap/role/ref/legacyRef 810
FASB Accounting Standards Codification 810 10 45 20 http://fasb.org/us-gaap/role/ref/legacyRef 810