| Standard label: | Floor Brokerage, Exchange and Clearance Fees |
| Name: | us-gaap:FloorBrokerageExchangeAndClearanceFees |
| Documentation: | The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FloorBrokerageExchangeAndClearanceFees |
| Label | Role | Language |
| Floor Brokerage, Exchange and Clearance Fees | http://www.xbrl.org/2003/role/label | en-US |
| Floor Brokerage, Exchange and Clearance Fees, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| Part Of Roll Up: |
| us-gaap:OperatingExpenses |