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Loans (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loans individually evaluated for impairment by portfolio segment
Impaired loans with allowance	$ 1,852	$ 1,493
Impaired loans, principal balance	29,225	26,971
Recorded Investment, Total	25,520	22,384
Commercial, industrial, and agricultural [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	2,542	4,329
Allowance recorded investment	1,792	2,815
Impaired loans with allowance	541	329
No allowance recorded Unpaid Principal Balance	2,804	3,892
No allowance recorded investment	2,251	3,300
Impaired loans without allowance
Commercial mortgages [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	5,870	4,724
Allowance recorded investment	5,329	4,065
Impaired loans with allowance	1,230	1,145
No allowance recorded Unpaid Principal Balance	17,285	13,839
No allowance recorded investment	15,555	12,080
Impaired loans without allowance
Residential real estate [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	416	187
Allowance recorded investment	381	124
Impaired loans with allowance	81	19
No allowance recorded Unpaid Principal Balance	308
No allowance recorded investment	212
Impaired loans without allowance

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