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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Loans:
Loans - Gross	$ 839,508	$ 823,771
Less: Net deferred loan fees and costs	(810)	(747)
Loans after net deferred loan fees and costs	838,698	823,024	$ 795,205
Less: Allowance for loan losses	(6,755)	(6,868)		$ (6,784)
Loans - Net	831,943	816,156
Consumer Real Estate [Member]
Loans:
Loans - Gross	83,134	83,620
Loans after net deferred loan fees and costs	82,629	83,200	83,875
Agricultural Real Estate [Member]
Loans:
Loans - Gross	68,548	64,073
Loans after net deferred loan fees and costs	68,524	64,044	63,571
Agricultural [Member]
Loans:
Loans - Gross	103,624	95,111
Loans after net deferred loan fees and costs	103,760	95,238	87,239
Commercial Real Estate [Member]
Loans:
Loans - Gross	417,217	410,520
Loans after net deferred loan fees and costs	416,632	409,953	393,913
Commercial and Industrial [Member]
Loans:
Loans - Gross	119,536	126,275
Loans after net deferred loan fees and costs	119,607	126,372
Consumer [Member]
Loans:
Loans - Gross	41,444	37,757
Loans after net deferred loan fees and costs	41,541	37,802	$ 35,887
Industrial Development Bonds [Member]
Loans:
Loans - Gross	6,005	6,415
Loans after net deferred loan fees and costs	$ 6,005	$ 6,415

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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 before allowance and after 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.

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