| Standard label: | Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) |
| Name: | us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss |
| Documentation: | Amount of gain (loss) on derivative instrument designated and qualifying as fair value hedge included in assessment of hedge effectiveness, recognized in earnings. |
| 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:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss |
| Label | Role | Language |
| Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 815 20 45 1A (a) | http://www.xbrl.org/2003/role/disclosureRef | 815 |