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Acquisition (Details Textual) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Heartland [Member]
Dec. 31, 2012
Heartland [Member]
Jul. 17, 2012
Heartland [Member]
Mar. 31, 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       1,442,449  
Net of allowance 19,565,000 18,270,000 18,270,000 18,882,000       1,418,000
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  
Increased the allowance for loan losses 2,084,000 559,000           1,400,000
Allowances for loan losses               $ 0