| Standard label: | Other Comprehensive Income (Loss), Tax |
| Name: | us-gaap:OtherComprehensiveIncomeLossTax |
| Documentation: | Amount of tax expense (benefit) allocated to other comprehensive income (loss). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OtherComprehensiveIncomeLossTax |
| Label | Role | Language |
| Other Comprehensive Income (Loss), Tax | http://www.xbrl.org/2003/role/label | en-US |
| Other Comprehensive Income (Loss), Tax, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 12 | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 740 20 45 2 (d) | http://www.xbrl.org/2003/role/disclosureRef | 740 |
| FASB Accounting Standards Codification 740 20 45 11 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 740 |
| Part Of Roll Up: |
| us-gaap:OtherComprehensiveIncomeLossNetOfTax |
| us-gaap:IncomeTaxEffectsAllocatedDirectlyToEquity |