| Standard label: | US Government Agencies Short-term Debt Securities [Member] |
| Name: | us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember |
| Documentation: | Debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae) which have maturities of one year or less. Excludes US Treasury securities and debt issued by Government-sponsored Enterprises (GSEs), for example, but not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae). |
| 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:USGovernmentAgenciesShorttermDebtSecuritiesMember |
| Label | Role | Language |
| US Government Agencies Short-term Debt Securities [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.6(a)(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |