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Acquisition (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amounts of loans    
Outstanding balance $ 1,190,717 $ 983,193
Carrying amount, net of allowance 1,170,196 965,285
Heartland Bancshares Inc [Member]
   
Amounts of loans    
Outstanding balance 98,903  
Carrying amount, net of allowance 98,903  
Commercial [Member] | Heartland Bancshares Inc [Member]
   
Amounts of loans    
Outstanding balance 63,952  
Real estate [Member] | Heartland Bancshares Inc [Member]
   
Amounts of loans    
Outstanding balance 18,662  
Consumer [Member] | Heartland Bancshares Inc [Member]
   
Amounts of loans    
Outstanding balance $ 16,289