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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Trading securities portfolio |  |  |  |  |
Trading securities portfolio | $ 1,317 |  | $ 1,317 |  | $ 1,429
Losses |  | 121 |  | 46 |
Gains | $ 44 |  | $ 104 |  |

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