| Standard label: | Deposits, Fair Value Disclosure |
| Name: | us-gaap:DepositsFairValueDisclosure |
| Documentation: | Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. |
| 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:DepositsFairValueDisclosure |
| Label | Role | Language |
| Deposits, Fair Value Disclosure | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| Part Of Roll Up: |
| us-gaap:FinancialLiabilitiesFairValueDisclosure |