| Standard label: | Investments Sold, Not yet Purchased [Table Text Block] |
| Name: | us-gaap:InvestmentsSoldNotYetPurchasedTextBlock |
| Documentation: | Tabular disclosure of the investments sold, not yet purchased (securities sold short). |
| Object type: | cm:Level3TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InvestmentsSoldNotYetPurchasedTextBlock |
| Label | Role | Language |
| Investments Sold, Not yet Purchased [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 2 (SX 210.12-12A) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |