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Acquired Loans Part 4 (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Mar. 16, 2012
Dec. 31, 2011
Apr. 15, 2011
Allowance for loan loss [Abstract]        
Balance, beginning $ 502,000      
Loans charged-off (104,000)      
Recoveries 362,000      
Net charge-offs 258,000      
Provision for loan losses, acquired loans 3,583,000      
Balance, ending 4,343,000      
Revolving credit agreements acquired   5,900,000   3,800,000
Total loans acquired subject to loss share agreement with the FDIC       97,800,000
Total percentage of loans acquired subject to loss-share agreement with the FDIC (in hundredths)       91.00%
Nonaccrual loans not accounted for under FASB ASC Topic 310-30 953,000   491,000  
Covered Loans [Member]
        
Allowance for loan loss [Abstract]        
Balance, beginning 502,000      
Loans charged-off 174,000      
Recoveries 195,000      
Net charge-offs 369,000      
Provision for loan losses, acquired loans 2,655,000      
Balance, ending 3,526,000      
Noncovered Loans [Member]
        
Allowance for loan loss [Abstract]        
Balance, beginning 0      
Loans charged-off (278,000)      
Recoveries 167,000      
Net charge-offs (111,000)      
Provision for loan losses, acquired loans 928,000      
Balance, ending $ 817,000