Details for Selection
| Standard label: | Investments Classified by Contractual Maturity Date [Table Text Block] |
| Name: | us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock |
| Documentation: | Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. |
| Commentary: | |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For period (duration) |
| Balance type: | |
| Object class: | [Text Block] |