| Standard label: | Due from Correspondent Brokers |
| Name: | us-gaap:DueFromCorrespondentBrokers |
| Documentation: | Amount receivable from correspondent broker-dealer. |
| 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:DueFromCorrespondentBrokers |
| Label | Role | Language |
| Due from Correspondent Brokers | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 940 20 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |
| FASB Accounting Standards Codification 940 20 45 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |