Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,104,959	$ 941,865
% of Total Loans	100.00%	100.00%
Net deferred origination costs	$ (2,612)	$ 1,515
Total gross loans	1,102,347	943,380
Allowance for credit losses	(12,915)	(9,130)
Total loans	1,089,432	934,250
Salaries and employee benefits deferred as loan origination costs	2,782	2,116	$ 2,453
Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	434,983
Remaining borrowing capacity	235,371
Small Business Administration Programs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	24,220	21,910
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 295,965	$ 125,700
% of Total Loans	26.90%	13.50%
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 273,994	$ 102,541
% of Total Loans	24.90%	10.90%
Commercial \| Commercial and industrial \| Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 192,916
Commercial \| Agricultural land and production
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 21,971	$ 23,159
% of Total Loans	2.00%	2.60%
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 716,124	$ 708,542
% of Total Loans	64.80%	75.10%
Real Estate \| Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 208,843	$ 197,946
% of Total Loans	18.90%	21.00%
Real Estate \| Real estate construction and other land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 55,419	$ 73,718
% of Total Loans	5.00%	7.80%
Real Estate \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 338,886	$ 329,333
% of Total Loans	30.70%	34.90%
Real Estate \| Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 84,258	$ 76,304
% of Total Loans	7.60%	8.10%
Real Estate \| Other real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 28,718	$ 31,241
% of Total Loans	2.60%	3.30%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 92,870	$ 107,623
% of Total Loans	8.30%	11.40%
Consumer \| Equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 55,634	$ 64,841
% of Total Loans	5.00%	6.90%
Consumer \| Consumer and installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 37,236	$ 42,782
% of Total Loans	3.30%	4.50%

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 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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