| Standard label: | US Treasury (UST) Interest Rate [Member] |
| Name: | us-gaap:UsTreasuryUstInterestRateMember |
| Documentation: | Interest rate on direct treasury obligation of U.S. government (UST). |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UsTreasuryUstInterestRateMember |
| Label | Role | Language |
| US Treasury (UST) Interest Rate [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 815 20 25 6A | http://www.xbrl.org/2009/role/commonPracticeRef | 815 |