| Standard label: | Investments, Fair Value Disclosure |
| Name: | us-gaap:InvestmentsFairValueDisclosure |
| Documentation: | Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. |
| 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:InvestmentsFairValueDisclosure |
| Label | Role | Language |
| Investments, Fair Value Disclosure | http://www.xbrl.org/2003/role/label | en-US |
| Investments, Fair Value Disclosure, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 820 10 50 2 (a) | http://www.xbrl.org/2003/role/disclosureRef | 820 |
| Part Of Roll Up: |
| us-gaap:AssetsFairValueDisclosure |