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Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Aging of the recorded investment in past due loans    
30-59 Days Past Due $ 4,381 $ 3,545
60-89 Days Past Due 2,406 3,559
Greater Than 90 Days Past Due 17,351 15,570
Total Past Due 24,138 22,674
Loans Not Past Due 889,476 830,095
Total 913,614 852,769
Commercial, industrial, and agricultural [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 396 239
60-89 Days Past Due 87 53
Greater Than 90 Days Past Due 6,716 6,959
Total Past Due 7,199 7,251
Loans Not Past Due 252,707 246,073
Total 259,906 253,324
Commercial mortgages [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 2,093 1,064
60-89 Days Past Due 1,681 2,620
Greater Than 90 Days Past Due 7,693 7,043
Total Past Due 11,467 10,727
Loans Not Past Due 245,564 231,784
Total 257,031 242,511
Residential real estate [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 1,299 1,816
60-89 Days Past Due 383 682
Greater Than 90 Days Past Due 2,668 1,411
Total Past Due 4,350 3,909
Loans Not Past Due 331,446 294,719
Total 335,796 298,628
Consumer [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 576 392
60-89 Days Past Due 234 185
Greater Than 90 Days Past Due 253 130
Total Past Due 1,063 707
Loans Not Past Due 54,916 52,764
Total 55,979 53,471
Credit cards [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 17 34
60-89 Days Past Due 21 19
Greater Than 90 Days Past Due 21 27
Total Past Due 59 80
Loans Not Past Due 4,513 4,332
Total 4,572 4,412
Overdrafts [Member]
    
Aging of the recorded investment in past due loans    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 0
Loans Not Past Due 330 423
Total $ 330 $ 423