| Standard label: | Effect on Future Earnings, Offset Amount |
| Name: | us-gaap:EffectOnFutureEarningsOffsetAmount |
| Documentation: | The amount that will be offset against future earnings by anticipated increases or decreases in other expenses or revenues. |
| 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:EffectOnFutureEarningsOffsetAmount |
| Label | Role | Language |
| Effect on Future Earnings, Offset Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 420 10 S99 2 (SAB TOPIC 5.P.4) | http://fasb.org/us-gaap/role/ref/legacyRef | 420 |