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Loans (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Acquired Impaired Loans        
Balance, January 1     $ 2,886 $ 3,221
Accretion     1,146 13
Principal payments received     (1,739) (173)
Other     4 60
Loans charged off (1,612) (3,456) (4) (5,483)
Balance, June 30 $ 2,293 $ 3,121 $ 2,293 $ 3,121