Loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 566,140	$ 453,721
Deferred net origination costs (fees)	(31)	62
Balance, end of period	566,109	453,783	457,407
Less allowance for loan losses	3,423	3,437
Loans, net	562,686	450,346
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	31,280	26,236
Balance, end of period	31,246	26,210
Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	302,311	238,357
Balance, end of period	301,984	238,129
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	216,318	175,031
Balance, end of period	216,558	175,269
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,928	10,554
Balance, end of period	13,018	10,631
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,245	1,668
Balance, end of period	3,245	1,668
Other Loans Including Deposits Overdraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	58	1,875
Financial Receivable Acquired Credit Imparied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	5,939
Deferred net origination costs (fees)	0
Balance, end of period	5,939
Less allowance for loan losses	0
Loans, net	5,939
Financial Receivable Acquired Credit Imparied [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	341
Balance, end of period	341
Financial Receivable Acquired Credit Imparied [Member] | Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	4,252
Balance, end of period	4,252
Financial Receivable Acquired Credit Imparied [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,346
Balance, end of period	1,346
Financial Receivable Acquired Credit Imparied [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	0
Financial Receivable Acquired Credit Imparied [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	0
Financial Receivable Acquired Credit Imparied [Member] | Other Loans Including Deposits Overdraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	0
Financial Receivable Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	560,201
Deferred net origination costs (fees)	(31)
Balance, end of period	560,170
Less allowance for loan losses	3,423
Loans, net	556,747
Financial Receivable Other [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	30,939
Balance, end of period	30,905
Financial Receivable Other [Member] | Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	298,059
Balance, end of period	297,732
Financial Receivable Other [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	214,972
Balance, end of period	215,212
Financial Receivable Other [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,928
Balance, end of period	13,018
Financial Receivable Other [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,245
Balance, end of period	3,245
Financial Receivable Other [Member] | Other Loans Including Deposits Overdraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 58