| Standard label: | Fiduciary and Trust [Member] |
| Name: | us-gaap:FiduciaryAndTrustMember |
| Documentation: | Person or entity with legal duty to act in best interest of client or beneficiary of trust and fiduciary relationship in which one party gives another party right to hold title to asset for benefit of beneficiary. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FiduciaryAndTrustMember |
| Label | Role | Language |
| Fiduciary and Trust [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 606 10 55 91 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 606 |