| Standard label: | Interest Revenue (Expense), Net |
| Name: | us-gaap:InterestRevenueExpenseNet |
| Documentation: | Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest). |
| 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:InterestRevenueExpenseNet |
| Label | Role | Language |
| Interest Revenue (Expense), Net | http://www.xbrl.org/2003/role/label | en-US |
| Interest Revenue (Expense), Net, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 280 10 50 22 | http://www.xbrl.org/2003/role/disclosureRef | 280 |