| Standard label: | Variable Interest Entity, Qualitative or Quantitative Information, Date Involvement Began |
| Name: | us-gaap:VariableInterestEntityQualitativeOrQuantitativeInformationDateInvolvementBegan1 |
| Documentation: | Date the relationship between reporting entity and the Variable Interest Entity (VIE) began, in CCYY-MM-DD format. |
| Object type: | cm:Concept |
| Data type: | Date (xbrli:dateItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:VariableInterestEntityQualitativeOrQuantitativeInformationDateInvolvementBegan1 |
| Label | Role | Language |
| Variable Interest Entity, Qualitative or Quantitative Information, Date Involvement Began | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 810 10 50 5A (d) | http://fasb.org/us-gaap/role/ref/legacyRef | 810 |
| FASB Accounting Standards Codification 810 10 50 6 b | http://fasb.org/us-gaap/role/ref/legacyRef | 810 |