| Standard label: | Financial Instruments Sold, Not yet Purchased, State and Municipal Government Obligations |
| Name: | us-gaap:FinancialInstrumentsSoldNotYetPurchasedStateAndMunicipalGovernmentObligations |
| Documentation: | Fair value of obligations arising from state and municipal debt obligations sold short. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FinancialInstrumentsSoldNotYetPurchasedStateAndMunicipalGovernmentObligations |
| Label | Role | Language |
| Financial Instruments Sold, Not yet Purchased, State and Municipal Government Obligations | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 940 320 35 1 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |