| Standard label: | Other Restricted Assets |
| Name: | us-gaap:OtherRestrictedAssets |
| Documentation: | Total assets that cannot be used for operating purposes because of contract or regulatory requirements that are in effect for a period that extends beyond one year. |
| 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:OtherRestrictedAssets |
| Label | Role | Language |
| Other Restricted Assets | http://www.xbrl.org/2003/role/label | en-US |
| Other Restricted Assets, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.17) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |