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cm:Concept: us-gaap:DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal
Standard label: Debt Securities, Held-to-maturity, Change in Present Value, Expense (Reversal)
Name: us-gaap:DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal
Documentation: Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity), from change in present value of expected cash flows.
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:DebtSecuritiesHeldToMaturityChangeInPresentValueExpenseReversal

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Labels
Label Role Language
Debt Securities, Held-to-maturity, Change in Present Value, Expense (Reversal) http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 326 20 45 3 http://www.xbrl.org/2003/role/disclosureRef 326
FASB Accounting Standards Codification 326 20 50 12 http://www.xbrl.org/2003/role/disclosureRef 326