| Standard label: | Interest Expense, Short-term Borrowings Excluding Federal Funds and Securities Sold under Agreements to Repurchase |
| Name: | us-gaap:InterestExpenseShortTermBorrowingsExcludingFederalFundsAndSecuritiesSoldUnderAgreementsToRepurchase |
| Documentation: | The aggregate interest expense incurred on short-term borrowings including commercial paper, Federal Home Loan Bank and Federal Reserve Bank advances and other short term borrowings. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InterestExpenseShortTermBorrowingsExcludingFederalFundsAndSecuritiesSoldUnderAgreementsToRepurchase |
| Label | Role | Language |
| Interest Expense, Short-term Borrowings Excluding Federal Funds and Securities Sold under Agreements to Repurchase | http://www.xbrl.org/2003/role/label | en-US |
| Interest Expense, Short-term Borrowings Excluding Federal Funds and Securities Sold under Agreements to Repurchase, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04.7) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |
| Part Of Roll Up: |
| us-gaap:InterestExpenseShortTermBorrowings |