| Standard label: | Maturity Less than 30 Days [Member] |
| Name: | us-gaap:MaturityUpTo30DaysMember |
| Documentation: | Maturity period of up to 30 days from the reporting date for repurchase agreements and similar transactions, for example, but not limited to, securities lending arrangements. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:MaturityUpTo30DaysMember |
| Label | Role | Language |
| Maturity Less than 30 Days [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 S99 1 (SX 210.4-08.(m)(1)(i)(A)) | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |