| Standard label: | Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Level of Subordination |
| Name: | us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherLevelOfSubordination |
| Documentation: | This item represents the current level of subordination of the entity's receipt of consideration should the assets underlying the security be liquidated when the level of subordination was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired. |
| Object type: | cm:Concept |
| Data type: | Decimal (xbrli:decimalItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherLevelOfSubordination |
| Label | Role | Language |
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Level of Subordination | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 320 10 50 6 | http://fasb.org/us-gaap/role/ref/legacyRef | 320 |