| Standard label: | Noninterest-bearing Domestic Deposit Description |
| Name: | us-gaap:NoninterestBearingDomesticDepositDescription |
| Documentation: | Description of noninterest-bearing domestic deposit liabilities, which may include methodology, assumptions and the types and amounts of domestic deposit liabilities. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:NoninterestBearingDomesticDepositDescription |
| Label | Role | Language |
| Noninterest-bearing Domestic Deposit Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.12) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |