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Securities Available for Sale - Proceeds, Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Available-for-sale Securities [Abstract]        
Proceeds $ 0 $ 0 $ 1,883 $ 0
Gross gains 0 0 816 0
Gross losses $ 0 $ 0 $ 0 $ 0