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cm:Concept: us-gaap:DebtSecuritiesGainLossExcludingOtti
Standard label: Debt Securities, Gain (Loss), Excluding OTTI
Name: us-gaap:DebtSecuritiesGainLossExcludingOtti
Documentation: Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Excludes other-than-temporary impairment (OTTI).
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:DebtSecuritiesGainLossExcludingOtti

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Labels
Label Role Language
Debt Securities, Gain (Loss), Excluding OTTI http://www.xbrl.org/2003/role/label en-US
Debt Securities, Gain (Loss), Excluding OTTI, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(7)(c)) http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(9)(a)) http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04(13)(g)) http://fasb.org/us-gaap/role/ref/legacyRef 942
FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(3)(d)) http://www.xbrl.org/2003/role/disclosureRef 944