| Standard label: | Debt-to-Value [Axis] |
| Name: | us-gaap:LoanToValueAxis |
| Documentation: | Information by debt-to-value ratio, for example, but not limited to, 80% to 100%. Element name and standard label in Debt-to-Value [numeric lower end] to [numeric higher end] Percent [Member] or Debt-to-Value Greater Than [low end numeric value] Percent [Member] or Debt-to-Value Less Than [high end numeric value] Percent [Member] formats. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LoanToValueAxis |
| Label | Role | Language |
| Debt-to-Value [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 326 20 55 15 (d) | http://www.xbrl.org/2003/role/exampleRef | 326 |