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Acquisition (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Amounts of loans      
Outstanding balance $ 1,089,768   $ 1,190,717
Carrying amount, net of allowance of $1,418 1,068,380 1,170,196  
Heartland Bancshares Inc [Member]
     
Amounts of loans      
Outstanding balance 86,596    
Carrying amount, net of allowance of $1,418 85,178    
Commercial [Member] | Heartland Bancshares Inc [Member]
     
Amounts of loans      
Outstanding balance 55,081    
Real estate [Member] | Heartland Bancshares Inc [Member]
     
Amounts of loans      
Outstanding balance 16,011    
Consumer [Member] | Heartland Bancshares Inc [Member]
     
Amounts of loans      
Outstanding balance $ 15,504