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Acquisition (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Jul. 17, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Heartland [Member]
Dec. 31, 2012
Heartland [Member]
Jul. 17, 2012
Heartland [Member]
Jun. 30, 2013
Heartland Bancshares Inc [Member]
Acquisition (Textual) [Abstract]                          
Date of acquisition agreement     Jul. 17, 2012                    
Exchange ratio per share to Heartland shareholder                       $ 0.81  
Market closing price per share                       $ 16.83  
Transaction value is estimated                       $ 26,900,000  
Costs related to the acquisition                     1,500,000    
Common stock issued                   1,168,383      
Common stock outstanding 8,617,466   8,617,466     8,617,466           1,442,449  
Net of allowance 18,880,000 18,374,000 18,880,000 18,374,000 19,565,000 18,270,000   19,412,000 18,882,000       404,000
Net tangible assets acquired                       26,900,000  
Net intangible assets acquired             2,332,000         2,300,000  
Purchase price of the business assets             2,647,000         10,800,000  
Acquisition of goodwill             13,838,000         13,800,000  
Core deposit intangible amortization period                   7 years      
Loan portfolio acquired                       131,100,000  
Discount on loan portfolio acquired                       16,500,000  
Performing portion of the loan portfolio acquired                       95,400,000  
Estimated fair value of performing portion of the loan portfolio                       91,600,000  
Total provision charged to operating expense 729,000 209,000 2,813,000 768,000                 1,500,000
Allowances for loan losses                         $ 0