| Standard label: | Cash Reserve Deposit Required and Made |
| Name: | us-gaap:CashReserveDepositRequiredAndMade |
| Documentation: | Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. |
| 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:CashReserveDepositRequiredAndMade |
| Label | Role | Language |
| Cash Reserve Deposit Required and Made | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 50 1 | http://www.xbrl.org/2009/role/commonPracticeRef | 942 |