| Standard label: | Schedule of Allocation of Plan Assets [Table Text Block] |
| Name: | us-gaap:ScheduleOfAllocationOfPlanAssetsTableTextBlock |
| Documentation: | Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. |
| Object type: | cm:Level3TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ScheduleOfAllocationOfPlanAssetsTableTextBlock |
| Examples of this text block disclosure: | AllocationOfPlanAssets |
| Label | Role | Language |
| Schedule of Allocation of Plan Assets [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (d)(5) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |