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Acquisition (Details 3) (Heartland Bancshares Inc [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Heartland Bancshares Inc [Member]
 
Accretable yield or income expected to be collected  
Balance at December 31, 2012 $ 6,111
Additions   
Accretion (451)
Reclassification from nonaccretable difference   
Disposals (696)
Balance at March 31, 2013 $ 4,964