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Investments (Details Textuals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Investments (Textuals)      
Realized net gains (losses) from sale of securities $ 86 $ 328  
Proceeds from sale of available-for-sale securities 3,854 5,808  
Cash surrender value of insurance contracts $ 69,857   $ 70,318