Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans
Loans	$ 920,056	$ 917,103
% of Total Loans	100.00%	100.00%
Deferred loan fees, net	$ 1,754	$ 1,592
Total gross loans	921,810	918,695
Allowance for credit losses	(9,118)	(9,104)
Total loans	912,692	909,591
Small Business Administration programs
Loans
Loans	23,992	22,297
Amount secured by government guarantees	$ 17,836	$ 16,493
Percent secured by government guarantees	74.00%	74.00%
Commercial
Loans
Loans	$ 107,960	$ 109,531
% of Total Loans	11.70%	12.00%
Commercial \| Commercial and industrial
Loans
Loans	$ 96,700	$ 101,533
% of Total Loans	10.50%	11.10%
Commercial \| Agricultural production
Loans
Loans	$ 11,260	$ 7,998
% of Total Loans	1.20%	0.90%
Real Estate
Loans
Loans	$ 699,745	$ 699,576
% of Total Loans	76.10%	76.20%
Real Estate \| Owner occupied
Loans
Loans	$ 188,901	$ 183,169
% of Total Loans	20.50%	19.90%
Real Estate \| Real estate construction and other land loans
Loans
Loans	$ 98,352	$ 101,606
% of Total Loans	10.70%	11.10%
Real Estate \| Commercial real estate
Loans
Loans	$ 308,099	$ 305,118
% of Total Loans	33.40%	33.20%
Real Estate \| Agricultural real estate
Loans
Loans	$ 70,589	$ 76,884
% of Total Loans	7.70%	8.40%
Real Estate \| Other real estate
Loans
Loans	$ 33,804	$ 32,799
% of Total Loans	3.80%	3.60%
Consumer
Loans
Loans	$ 112,351	$ 107,996
% of Total Loans	12.20%	11.80%
Consumer \| Equity loans and lines of credit
Loans
Loans	$ 72,686	$ 69,958
% of Total Loans	7.90%	7.60%
Consumer \| Consumer and installment
Loans
Loans	$ 39,665	$ 38,038
% of Total Loans	4.30%	4.20%

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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