| Standard label: | Securities Financing Transaction [Axis] |
| Name: | us-gaap:SecuritiesFinancingTransactionAxis |
| Documentation: | Information by type of securities financing transactions, including, but not limited to those measured at fair value or cost. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:SecuritiesFinancingTransactionAxis |
| Label | Role | Language |
| Securities Financing Transaction [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 20 45 11 | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 235 10 S99 1 (SX 210.4-08.(m)) | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |
| FASB Accounting Standards Codification 860 30 50 1A | http://fasb.org/us-gaap/role/ref/legacyRef | 860 |