| Standard label: | Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |
| Name: | us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount |
| Documentation: | The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount |
| Label | Role | Language |
| Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 810 10 50 4 b | http://fasb.org/us-gaap/role/ref/legacyRef | 810 |
| FASB Accounting Standards Codification 810 10 50 6 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 810 |
| Part Of Roll Up: |
| us-gaap:VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure |