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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Available for sale securities proceeds and gross realized gain loss net    
Gross gains realized on sales $ 294 $ 0
Gross losses realized on sales 0 0
Other-than-temporary impairment recognized 0 0
Net realized gains $ 294 $ 0