| Standard label: | Available-for-sale Securities, Failed Auction, Value |
| Name: | us-gaap:AvailableforsaleSecuritiesFailedAuctionValue |
| Documentation: | The value of securities held, for which the interest rate resets through an auction process, that are categorized neither as trading nor held-to-maturity, that failed to be liquidated through auction. |
| 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:AvailableforsaleSecuritiesFailedAuctionValue |
| Label | Role | Language |
| Available-for-sale Securities, Failed Auction, Value | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |