Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans
Loans	$ 777,717	$ 755,361
% of Total Loans	100.00%	100.00%
Deferred loan fees, net	$ 1,009	$ 1,267
Total gross loans	778,726	756,628
Allowance for credit losses	(8,916)	(9,326)
Total loans	769,810	747,302
Small Business Administration programs
Loans
Real estate and commercial loans	24,569	16,590
Amount secured by government guarantees	$ 18,170	$ 12,188
Percent secured by government guarantees	74.00%	73.00%
Commercial
Loans
Loans	$ 108,585	$ 114,161
% of Total Loans	14.00%	15.10%
Commercial \| Commercial and industrial
Loans
Loans	$ 90,511	$ 88,652
% of Total Loans	11.60%	11.70%
Commercial \| Agricultural land and production
Loans
Loans	$ 18,074	$ 25,509
% of Total Loans	2.40%	3.40%
Real Estate
Loans
Loans	$ 579,715	$ 550,796
% of Total Loans	74.50%	72.90%
Real Estate \| Owner occupied
Loans
Loans	$ 191,918	$ 191,665
% of Total Loans	24.60%	25.30%
Real Estate \| Real estate construction and other land loans
Loans
Loans	$ 84,135	$ 69,200
% of Total Loans	10.80%	9.10%
Real Estate \| Commercial real estate
Loans
Loans	$ 212,008	$ 184,225
% of Total Loans	27.20%	24.30%
Real Estate \| Agricultural real estate
Loans
Loans	$ 72,082	$ 86,761
% of Total Loans	9.30%	11.50%
Real Estate \| Other real estate
Loans
Loans	$ 19,572	$ 18,945
% of Total Loans	2.60%	2.70%
Consumer
Loans
Loans	$ 89,417	$ 90,404
% of Total Loans	11.50%	12.00%
Consumer \| Equity loans and lines of credit
Loans
Loans	$ 61,822	$ 64,494
% of Total Loans	8.00%	8.50%
Consumer \| Consumer and installment
Loans
Loans	$ 27,595	$ 25,910
% of Total Loans	3.50%	3.50%

Loans and Leases Receivable, Gross, Real Estate and Commercial

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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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