| Standard label: | Secured Demand Notes |
| Name: | us-gaap:SecuredDemandNotes |
| Documentation: | Represents the carrying amount as of the balance sheet date of loans made to broker-dealers which are generally secured by marketable securities owned by the borrower broker-dealer but held by the lender, are interest-bearing, and payable upon demand. The right to demand payment may be conditioned upon the occurrence of certain events. |
| 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:SecuredDemandNotes |
| Label | Role | Language |
| Secured Demand Notes | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 860 30 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 860 |
| FASB Accounting Standards Codification 860 30 40 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 860 |