| Standard label: | Receivables from Customers |
| Name: | us-gaap:ReceivablesFromCustomers |
| Documentation: | Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. |
| 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:ReceivablesFromCustomers |
| Label | Role | Language |
| Receivables from Customers | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |