| Standard label: | Debt-to-Value Ratio, Less than 80 Percent [Member] |
| Name: | us-gaap:LtvLessThan80PercentMember |
| Documentation: | Debt-to-value (DTV) ratio less than 80%. Element name and standard label in DTV Greater Than [low end numeric value] Percent [Member] or DTV Less Than [high end numeric value] Percent [Member] formats. |
| 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:LtvLessThan80PercentMember |
| Label | Role | Language |
| Debt-to-Value Ratio, Less than 80 Percent [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |