| Standard label: | Subordinated Borrowing [Table] |
| Name: | us-gaap:SubordinatedBorrowingTable |
| Documentation: | Schedule of borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC's uniform net capital rule, including restrictive covenants, collateral, interest rates and due dates, amounts due by date and amount owed in total. |
| 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:SubordinatedBorrowingTable |
| Label | Role | Language |
| Subordinated Borrowing [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 470 45 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |