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Securities Available for Sale - Proceeds, Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Available-for-sale Securities [Abstract]        
Proceeds $ 0 $ 26,563 $ 6,636 $ 28,446
Gross gains 0 132 54 948
Gross losses $ 0 $ 0 $ 0 $ 0