| Standard label: | Repayments of Subordinated Debt |
| Name: | us-gaap:RepaymentsOfSubordinatedDebt |
| Documentation: | The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RepaymentsOfSubordinatedDebt |
| Label | Role | Language |
| Repayments of Subordinated Debt | http://www.xbrl.org/2003/role/label | en-US |
| Repayments of Subordinated Debt, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 15 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| Part Of Roll Up: |
| us-gaap:RepaymentsOfLongTermDebt |