| Standard label: | Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] |
| Name: | us-gaap:ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable |
| Documentation: | Schedule, table or text reflecting equity-based arrangements (such as stock or unit options and stock or unit awards) with individual employees, which are generally based on employment contracts between the entity and one or more selected officers or key employees, and which contain a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable |
| Label | Role | Language |
| Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 710 10 30 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 710 |
| FASB Accounting Standards Codification 710 10 55 7 | http://fasb.org/us-gaap/role/ref/legacyRef | 710 |
| FASB Accounting Standards Codification 710 10 55 8 | http://fasb.org/us-gaap/role/ref/legacyRef | 710 |
| FASB Accounting Standards Codification 718 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |
| FASB Accounting Standards Codification 718 10 50 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |