| Standard label: | Debt Securities, Trading, and Equity Securities, FV-NI |
| Name: | us-gaap:TradingSecurities |
| Documentation: | Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). |
| 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:TradingSecurities |
| Label | Role | Language |
| Debt Securities, Trading, and Equity Securities, FV-NI | http://www.xbrl.org/2003/role/label | en-US |
| Debt Securities, Trading, and Equity Securities, FV-NI, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.4) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |