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Acquisitions and FDIC Indemnification Asset (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 02, 2009
Jul. 31, 2009
First National Bank Of Danville [Member]
Mar. 31, 2013
First National Bank Of Danville [Member]
Dec. 31, 2009
First National Bank Of Danville [Member]
Jul. 02, 2009
First National Bank Of Danville [Member]
Jul. 02, 2009
First National Bank Of Danville [Member]
ASC 310-30 Loans [Member]
Mar. 18, 2013
Bank Of Amercia [Member]
Liabilities               $ 146,300,000    
Cash and cash equivalents               31,000,000    
Customer related core deposit intangible asset               4,600,000    
Estimated fair value of the loans       60,700,000         16,700,000  
Contractually required payments receivable       58,400,000         31,600,000  
Fair value of assets               151,800,000   2,300,000
Cash received (disbursed) from purchase of business unit         14,600,000          
Gain on acquisition             5,100,000      
Allowance for credit losses                 18,400,000  
Loans               77,500,000    
Investment securities               24,200,000    
Deposits payable               145,700,000   250,000,000
Losses on assets, threshold under loss-sharing agreement             29,000,000      
Percentage of losses to be reimbursed by the FDIC, on losses up to the threshold amount             80.00%      
Percentage of losses to be reimbursed by the FDIC, on losses exceeding the threshold amount             95.00%      
Percentage of loans, acquired and subject to the loss-sharing agreement with the FDIC, which were included in the estimate of future potential losses           80.00%        
Reimbursements from the FDIC 160,000 2,174,000       18,100,000        
Outstanding balance for reimbursement of losses 1,770,000 2,632,000 2,384,000     1,800,000        
Net changes in losses and expenses added $ (702,000) $ 2,422,000       $ 729,000