| Standard label: | Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value |
| Name: | us-gaap:FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue |
| Documentation: | The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. |
| 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:FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue |
| Label | Role | Language |
| Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 940 320 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |