Loans (Details 7) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Loans	Dec. 31, 2012 Loans
Restructured in a troubled debt
Number of Loans	11	10
Loans Balance	$ 9,882	$ 11,621
Specific Reserve	636	1,099
Commercial, industrial, and agricultural [Member]
Restructured in a troubled debt
Number of Loans	2	2
Loans Balance	1,386	1,420
Specific Reserve	0	0
Commercial mortgages [Member]
Restructured in a troubled debt
Number of Loans	9	8
Loans Balance	8,496	10,201
Specific Reserve	636	1,099
Residential real estate [Member]
Restructured in a troubled debt
Number of Loans	0	0
Loans Balance	0	0
Specific Reserve	0	0
Consumer [Member]
Restructured in a troubled debt
Number of Loans	0	0
Loans Balance	0	0
Specific Reserve	0	0
Credit cards [Member]
Restructured in a troubled debt
Number of Loans	0	0
Loans Balance	0	0
Specific Reserve	$ 0	$ 0