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Investments (Details Textuals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Investments (Textuals)          
Realized net gains (losses) from sale of securities $ 1,180 $ (1,304) $ 1,508 $ (1,468)  
Proceeds from sale of available-for-sale securities     16,157 26,761  
Cash surrender value of insurance contracts $ 68,053   $ 68,053   $ 67,699