| Standard label: | Industry Specific Policies, Broker Dealer [Policy Text Block] |
| Name: | us-gaap:IndustrySpecificPoliciesBrokerDealerTextBlock |
| Documentation: | Disclosure of accounting policy for recognition of revenues and expenses including commissions, underwriting, management and investment advisory fees, trading gains and losses, interest income and expense, dividend income and expense, floor brokerage, and exchange fees. Also, may include the broker-dealers' disclosure on the nature of operations and estimates used in preparation of financial statements and significant estimates. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:IndustrySpecificPoliciesBrokerDealerTextBlock |
| Examples of this text block disclosure: | BrokersAndDealersPolicies |
| Label | Role | Language |
| Industry Specific Policies, Broker Dealer [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |
| FASB Accounting Standards Codification 940 10 05 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |