| Standard label: | Available-for-sale Securities, Transfers to Trading, Gross Gains |
| Name: | us-gaap:AvailableForSaleSecuritiesTransfersToTradingGrossGains |
| Documentation: | Amount of gain included in earnings for reclassification of securities from available-for-sale into trading. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AvailableForSaleSecuritiesTransfersToTradingGrossGains |
| Label | Role | Language |
| Available-for-sale Securities, Transfers to Trading, Gross Gains | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |