| Standard label: | Unamortized Discounts on Acceptances Resold |
| Name: | us-gaap:UnamortizedDiscountsOnAcceptancesResold |
| Documentation: | The amount of the unamortized discount or expense related to the financial institution's sale of short-term negotiable time drafts drawn on and accepted by the institution (also known as Banker's Acceptances) in the secondary market. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UnamortizedDiscountsOnAcceptancesResold |
| Label | Role | Language |
| Unamortized Discounts on Acceptances Resold | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 20 45 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03(14)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |