| Standard label: | Defined Benefit Plan, Plan Assets, Amount |
| Name: | us-gaap:DefinedBenefitPlanFairValueOfPlanAssets |
| Documentation: | Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanFairValueOfPlanAssets |
| Label | Role | Language |
| Defined Benefit Plan, Plan Assets, Amount | http://www.xbrl.org/2003/role/label | en-US |
| Defined Benefit Plan, Plan Assets, Amount, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Defined Benefit Plan, Plan Assets, Amount, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (b) | http://www.xbrl.org/2003/role/disclosureRef | 715 |
| FASB Accounting Standards Codification 715 20 50 1 (d)(ii) | http://www.xbrl.org/2003/role/disclosureRef | 715 |
| FASB Accounting Standards Codification 715 20 50 1 (d)(ii) | http://www.xbrl.org/2003/role/exampleRef | 715 |
| FASB Accounting Standards Codification 715 20 50 1 (d)(iv)(01) | http://www.xbrl.org/2003/role/disclosureRef | 715 |
| FASB Accounting Standards Codification 715 20 50 1 (d)(iv)(01) | http://www.xbrl.org/2003/role/exampleRef | 715 |
| FASB Accounting Standards Codification 715 20 55 17 | http://www.xbrl.org/2003/role/exampleRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanFundedStatusOfPlan |