Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 917,103,000	$ 899,320,000
% of Total Loans	100.00%	100.00%
Net deferred origination costs	$ 1,592,000	$ 1,359,000
Total gross loans	918,695,000	900,679,000
Allowance for credit losses	(9,104,000)	(8,778,000)
Total loans	909,591,000	891,901,000
Salaries and employee benefits deferred as loan origination costs	2,453,000	2,593,000	$ 2,344,000
Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	447,757,000
Remaining borrowing capacity	286,934,000
Small Business Administration Programs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	22,297,000	25,925,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 109,531,000	$ 115,812,000
% of Total Loans	12.00%	12.90%
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 101,533,000	$ 100,856,000
% of Total Loans	11.10%	11.20%
Commercial \| Agricultural land and production
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 7,998,000	$ 14,956,000
% of Total Loans	0.90%	1.70%
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 699,576,000	$ 677,467,000
% of Total Loans	76.20%	75.20%
Real Estate \| Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 183,169,000	$ 204,452,000
% of Total Loans	19.90%	22.70%
Real Estate \| Real estate construction and other land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 101,606,000	$ 96,460,000
% of Total Loans	11.10%	10.70%
Real Estate \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 305,118,000	$ 269,254,000
% of Total Loans	33.20%	29.90%
Real Estate \| Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 76,884,000	$ 76,081,000
% of Total Loans	8.40%	8.40%
Real Estate \| Other real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 32,799,000	$ 31,220,000
% of Total Loans	3.60%	3.50%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 107,996,000	$ 106,041,000
% of Total Loans	11.80%	11.90%
Consumer \| Equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 69,958,000	$ 76,404,000
% of Total Loans	7.60%	8.50%
Consumer \| Consumer and installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 38,038,000	$ 29,637,000
% of Total Loans	4.20%	3.40%

Loans and Leases Receivable, Percentage of Gross Loans

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Salaries and Employee Benefits Deferred As Loan Origination Costs

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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