Details for Selection
| Standard label: | Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Vintage |
| Name: | us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherVintage |
| Documentation: | This item represents the vintage of the available-for-sale investments which has been considered as one of the potential factors in reaching a conclusion that the investments are not other-than-temporarily impaired. |
| Commentary: | |
| Data type: | Date (xbrli:dateItemType) |
| Period type: | For period (duration) |
| Balance type: | |
| Object class: | [Concept] |