| Standard label: | Commissions and Floor Brokerage Receivables |
| Name: | us-gaap:CommissionsAndFloorBrokerageReceivables |
| Documentation: | Amount receivable from broker-dealers from commissions for executing orders on the floor of an exchange. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CommissionsAndFloorBrokerageReceivables |
| Label | Role | Language |
| Commissions and Floor Brokerage Receivables | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 940 20 25 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |