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Loans (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment $ 1,684   $ 1,265      
Allowance for loan losses, Collectively evaluated for impairment 11,234   11,122      
Allowance for loan losses, Modified in a troubled debt restructuring 772   228      
Total ending allowance balance 13,690 13,015 12,615 11,715 11,224 10,820
Loans:            
Loans individually evaluated for impairment 16,749   14,696      
Loans collectively evaluated for impairment 882,685   830,385      
Loans modified in a troubled debt restructuring 10,450   7,688      
Total ending loans balance 909,884   852,769      
Commercial industrial and agricultural [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 1,282   329      
Allowance for loan losses, Collectively evaluated for impairment 3,833   4,182      
Allowance for loan losses, Modified in a troubled debt restructuring 0           
Total ending allowance balance 5,115 4,942 4,511 3,770 3,732 3,517
Loans:            
Loans individually evaluated for impairment 7,778   6,115      
Loans collectively evaluated for impairment 258,047   247,209      
Loans modified in a troubled debt restructuring 297           
Total ending loans balance 266,122   253,324      
Commercial mortgages [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 347   917      
Allowance for loan losses, Collectively evaluated for impairment 3,434   3,325      
Allowance for loan losses, Modified in a troubled debt restructuring 772   228      
Total ending allowance balance 4,553 4,377 4,470 4,399 3,879 3,511
Loans:            
Loans individually evaluated for impairment 8,343   8,457      
Loans collectively evaluated for impairment 242,292   226,366      
Loans modified in a troubled debt restructuring 10,153   7,688      
Total ending loans balance 260,788   242,511      
Residential real estate [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 55   19      
Allowance for loan losses, Collectively evaluated for impairment 2,170   1,972      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Total ending allowance balance 2,225 1,997 1,991 1,900 1,879 1,916
Loans:            
Loans individually evaluated for impairment 628   124      
Loans collectively evaluated for impairment 324,572   298,504      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 325,200   298,628      
Consumer [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 1,568   1,404      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Total ending allowance balance 1,568 1,435 1,404 1,400 1,507 1,561
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 54,251   54,677      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 54,251   54,677      
Credit cards [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 81   71      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Total ending allowance balance 81 96 71 104 96 96
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 3,239   3,206      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 3,239   3,206      
Overdrafts [Member]
            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 148   168      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Total ending allowance balance 148 168 168 142 131 219
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 284   423      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance $ 284   $ 423