Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 549,689	$ 453,721
Deferred net origination (fees) costs	(22)	62
Total gross loans	549,667	453,783	456,981
Less allowance for loan losses	3,404	3,437
Loans, net	546,263	450,346
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	35,452	26,236
Total gross loans	35,415	26,210
Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	283,144	230,256
Total gross loans	282,844	230,028
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	214,282	183,132
Total gross loans	214,484	183,370
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	13,860	10,554
Total gross loans	13,973	10,631
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,805	1,668
Total gross loans	1,805	1,668
Other Loans Including Deposits Overdraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 1,146	$ 1,875