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Fair Value (Details Textual) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Level 3 [Member] | Dec. 31, 2011 Level 3 [Member]
Fair Value (Textual) [Abstract] |  |  |  |
Securities of less transparency |  |  | 0 | 0
Transfers between valuation levels for any assets | $ 0 | $ 0 |  |

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