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Loans (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loans individually evaluated for impairment by portfolio segment
Impaired loans with allowance	$ 1,356	$ 1,852
Impaired loans, principal balance	27,197	29,225
Recorded Investment, Total	23,068	25,520
Commercial, industrial, and agricultural [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	2,219	2,542
Allowance recorded investment	1,468	1,792
Impaired loans with allowance	541	541
No allowance recorded Unpaid Principal Balance	2,752	2,804
No allowance recorded investment	2,225	2,251
Impaired loans without allowance	0	0
Commercial mortgages [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	5,879	5,870
Allowance recorded investment	4,885	5,329
Impaired loans with allowance	787	1,230
No allowance recorded Unpaid Principal Balance	16,062	17,285
No allowance recorded investment	14,289	15,555
Impaired loans without allowance	0	0
Residential real estate [Member]
Loans individually evaluated for impairment by portfolio segment
Allowance recorded Unpaid Principal Balance	127	416
Allowance recorded investment	123	381
Impaired loans with allowance	28	81
No allowance recorded Unpaid Principal Balance	158	308
No allowance recorded investment	78	212
Impaired loans without allowance	$ 0	$ 0

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