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

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

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References
Reference Role Topic

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Roll Up Relations
Part Of Roll Up:
us-gaap:DebtAndEquitySecuritiesRealizedGainLoss