| Standard label: | Security Owned and Sold, Not yet Purchased, at Fair Value [Table] |
| Name: | us-gaap:SecurityOwnedAndSoldNotYetPurchasedAtFairValueTable |
| Documentation: | Schedule of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes that are carried at fair value including securities sold, not yet purchased. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:SecurityOwnedAndSoldNotYetPurchasedAtFairValueTable |
| Label | Role | Language |
| Security Owned and Sold, Not yet Purchased, at Fair Value [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 940 320 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |