Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Loans
Loans	$ 576,730us-gaap_NotesReceivableGross	$ 572,442us-gaap_NotesReceivableGross
% of Total Loans	100.00%	100.00%
Deferred loan fees, net	263	146
Total gross loans	576,993	572,588
Allowance for credit losses	(8,399)	(8,308)
Total loans	568,594	564,280
Small Business Administration programs
Loans
Real estate and commercial loans	9,790	8,782
Commercial
Loans
Loans	124,339	128,147
% of Total Loans	21.50%	22.30%
Real Estate Portfolio Segment
Loans
Loans	398,998	386,627
% of Total Loans	69.20%	67.60%
Real estate
Loans
Loans	398,998	386,627
Consumer
Loans
Loans	53,393	57,668
% of Total Loans	9.30%	10.10%
Commercial and industrial
Loans
Loans	90,236	89,007
% of Total Loans	15.60%	15.50%
Agricultural land and production
Loans
Loans	34,103	39,140
% of Total Loans	5.90%	6.80%
Owner occupied
Loans
Loans	175,756	176,804
% of Total Loans	30.60%	30.90%
Real estate construction and other land loans
Loans
Loans	40,280	38,923
% of Total Loans	7.00%	6.80%
Commercial real estate
Loans
Loans	108,086	106,788
% of Total Loans	18.70%	18.70%
Agricultural real estate
Loans
Loans	67,202	57,501
% of Total Loans	11.60%	10.00%
Other real estate
Loans
Loans	7,674	6,611
% of Total Loans	1.30%	1.20%
Equity loans and lines of credit
Loans
Loans	45,744	47,575
% of Total Loans	7.90%	8.30%
Consumer and installment
Loans
Loans	7,649	10,093
% of Total Loans	1.40%	1.80%
Acquired During Period
Loans
Total loans	$ 73,187	$ 77,882

Loans and Leases Receivable, Gross, Real Estate and Commercial

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Loans and Leases Receivable, Percentage of Gross Loans

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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