Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 941,865	$ 917,103
% of Total Loans	100.00%	100.00%
Net deferred origination costs	$ 1,515	$ 1,592
Total gross loans	943,380	918,695
Allowance for credit losses	(9,130)	(9,104)
Total loans	934,250	909,591
Salaries and employee benefits deferred as loan origination costs	2,116	2,453	$ 2,593
Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	446,494
Remaining borrowing capacity	304,987
Small Business Administration Programs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,910	22,297
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 125,700	$ 109,531
% of Total Loans	13.50%	12.00%
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 102,541	$ 101,533
% of Total Loans	10.90%	11.10%
Commercial \| Agricultural land and production
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 23,159	$ 7,998
% of Total Loans	2.60%	0.90%
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 708,542	$ 699,576
% of Total Loans	75.10%	76.20%
Real Estate \| Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 197,946	$ 183,169
% of Total Loans	21.00%	19.90%
Real Estate \| Real estate construction and other land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 73,718	$ 101,606
% of Total Loans	7.80%	11.10%
Real Estate \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 329,333	$ 305,118
% of Total Loans	34.90%	33.20%
Real Estate \| Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 76,304	$ 76,884
% of Total Loans	8.10%	8.40%
Real Estate \| Other real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 31,241	$ 32,799
% of Total Loans	3.30%	3.60%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 107,623	$ 107,996
% of Total Loans	11.40%	11.80%
Consumer \| Equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 64,841	$ 69,958
% of Total Loans	6.90%	7.60%
Consumer \| Consumer and installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 42,782	$ 38,038
% of Total Loans	4.50%	4.20%

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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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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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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