| Standard label: | Underwriting Commitments |
| Name: | us-gaap:UnderwritingCommitments |
| Documentation: | Disclose the effect on the financial statements of underwriting commitments open at year-end and subsequently settled. |
| 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:UnderwritingCommitments |
| Label | Role | Language |
| Underwriting Commitments | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 940 20 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 940 |