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Investments (Details Textuals) (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
Investments (Textuals)          
Realized net gains (losses) from sale of securities $ 1,728 $ (872) $ 3,236 $ (2,340)  
Proceeds from sale of available-for-sale securities     33,437 43,182  
Cash surrender value of insurance contracts $ 67,789   $ 67,789   $ 67,699