Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 982,710	$ 911,597
Net deferred loan fees, premiums and discounts	(420)	(744)
Allowance for loan losses	13,249	11,776	11,120	10,393
Net loans	969,041	899,077
Loans held for sale	514	212
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	25,321	31,341
Farm loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	109,376	86,256
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	184,158	186,205
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	50,174	44,863
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	357,726	317,321
Debt coverage ratio	1.20x
Amortization period of loans	twenty years
Commercial real estate | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan To Value Ratio	65.00%
Commercial real estate | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan To Value Ratio	80.00%
Loans secured by real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	726,755	665,986
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	64,055	60,948
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	168,227	160,193
Loan To Value Ratio	80.00%
Amortization period of loans	seven years
Loans Receivable, Time Period	one year
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	14,579	16,264
Allowance for loan losses	377	403	378	392
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	9,094	8,206
Agricultural and Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	173,400	147,200
Increase (Decrease) in Accounts and Notes Receivable	26,200
Loan To Value Ratio	65.00%
Amortization period of loans	twenty five years
Loans Receivable, Time Period	one year
Other Grain Farming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	147,100	124,367
Increase (Decrease) in Accounts and Notes Receivable	22,700
Motels and Hotels Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	50,608
Non-residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	97,982
Residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	58,792
Commercial/Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10,646	9,301	8,791	8,307
Agriculture/Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	533	558	546	404
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	771	726	636	440
Loan To Value Ratio	80.00%
Amortization period of loans	twenty five years
Balloon period	five years
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 922	$ 788	$ 769	$ 850