| Standard label: | Excess Tangible Capital |
| Name: | us-gaap:ExcessTangibleCapital |
| Documentation: | Tangible Capital, which, generally includes outstanding stock plus retained earnings, in excess of the minimum amount of tangible capital required. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ExcessTangibleCapital |
| Label | Role | Language |
| Excess Tangible Capital | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 505 50 1H | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |