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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Trading securities portfolio |  |  |  |  |
Trading securities portfolio | $ 1,151 |  | $ 1,151 |  | $ 1,276
Losses | 12 | 26 |  |  |
Gains |  |  | 33 | 60 |
U.S. government security funds |  |  |  |  |
Trading securities portfolio |  |  |  |  |
Net Unrealized Losses | $ 14 |  | $ 14 |  | $ 9

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