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Loans (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment $ 720 $ 753    
Allowance for loan losses, Collectively evaluated for impairment 12,541 12,208    
Allowance for loan losses, Modified in a troubled debt restructuring 636 1,099    
Total ending allowance balance 13,897 14,060 13,015 12,615
Loans:        
Loans individually evaluated for impairment 13,186 13,899    
Loans collectively evaluated for impairment 909,628 902,304    
Loans modified in a troubled debt restructuring 9,882 11,621    
Total ending loans balance 932,696 927,824    
Commercial, Industrial, and Agricultural [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 541 541    
Allowance for loan losses, Collectively evaluated for impairment 4,730 4,399    
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 5,271 4,940 4,942 4,511
Loans:        
Loans individually evaluated for impairment 2,307 2,623    
Loans collectively evaluated for impairment 255,662 253,048    
Loans modified in a troubled debt restructuring 1,386 1,420    
Total ending loans balance 259,355 257,091    
Commercial Mortgages [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 151 131    
Allowance for loan losses, Collectively evaluated for impairment 3,512 3,467    
Allowance for loan losses, Modified in a troubled debt restructuring 636 1,099    
Total ending allowance balance 4,299 4,697 4,377 4,470
Loans:        
Loans individually evaluated for impairment 10,678 10,683    
Loans collectively evaluated for impairment 246,847 240,907    
Loans modified in a troubled debt restructuring 8,496 10,201    
Total ending loans balance 266,021 261,791    
Residential Real Estate [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 28 81    
Allowance for loan losses, Collectively evaluated for impairment 2,367 2,385    
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 2,395 2,466 1,997 1,991
Loans:        
Loans individually evaluated for impairment 201 593    
Loans collectively evaluated for impairment 346,996 347,311    
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 347,197 347,904    
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 1,707 1,699    
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 1,707 1,699 1,435 1,404
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 54,573 55,267    
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 54,573 55,267    
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 77 83    
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 77 83 96 71
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 4,604 4,800    
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 4,604 4,800    
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 148 175    
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 148 175 168 168
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 946 971    
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance $ 946 $ 971