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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sales of securities available for sale        
Proceeds $ 14,991 $ 153,299 $ 14,991 $ 170,689
Gross gains 3 1,115 3 1,754
Gross losses $ (1)    $ (1)