Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Aging of the recorded investment in past due loans
30-59 Days Past Due	$ 4,039	$ 3,545
60-89 Days Past Due	4,207	3,559
Greater Than 90 Days Past Due	14,587	15,570
Total Past Due	22,833	22,674
Loans Not Past Due	908,392	830,095
Total	931,225	852,769
Commercial, industrial, and agricultural [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due	724	239
60-89 Days Past Due	157	53
Greater Than 90 Days Past Due	2,968	6,959
Total Past Due	3,849	7,251
Loans Not Past Due	253,242	246,073
Total	257,091	253,324
Commercial mortgages [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due	1,162	1,064
60-89 Days Past Due	3,197	2,620
Greater Than 90 Days Past Due	8,679	7,043
Total Past Due	13,038	10,727
Loans Not Past Due	248,753	231,784
Total	261,791	242,511
Residential real estate [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due	1,390	1,816
60-89 Days Past Due	641	682
Greater Than 90 Days Past Due	2,700	1,411
Total Past Due	4,731	3,909
Loans Not Past Due	343,173	294,719
Total	347,904	298,628
Consumer [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due	724	392
60-89 Days Past Due	203	185
Greater Than 90 Days Past Due	227	130
Total Past Due	1,154	707
Loans Not Past Due	57,514	52,764
Total	58,668	53,471
Credit cards [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due	39	34
60-89 Days Past Due	9	19
Greater Than 90 Days Past Due	13	27
Total Past Due	61	80
Loans Not Past Due	4,739	4,332
Total	4,800	4,412
Overdrafts [Member]
Aging of the recorded investment in past due loans
30-59 Days Past Due
60-89 Days Past Due
Greater Than 90 Days Past Due
Total Past Due
Loans Not Past Due	971	423
Total	$ 971	$ 423