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Investments (Details 2) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Trading securities portfolio |  |  |
Trading securities portfolio | $ 992 |  | $ 1,038
Gains |  | $ 44 |
Losses | 37 |  |
U.S. government security funds |  |  |
Trading securities portfolio |  |  |
Net Unrealized Losses | $ 5 |  | $ 15

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