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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Available for sale securities proceeds and gross realized gain loss net      
Proceeds from sales of available for sales securities $ 42,735 $ 36,923 $ 114,899
Gains realized on sales 26 0 0
Losses realized on sales 0 0 0
Other-than-temporary impairment recognized 0 0 0
Investment securities gains $ 26 $ 0 $ 0