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Investments (Details Textuals) (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
Investments (Textuals)          
Realized net gains (losses) from sale of securities $ 106 $ 1,180 $ 192 $ 1,508  
Proceeds from sale of available-for-sale securities     8,790 16,157  
Cash surrender value of insurance contracts $ 70,632   $ 70,632   $ 70,318