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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Loans:
Loans - Gross	$ 795,938	$ 758,820
Less: Net deferred loan fees and costs	(733)	(726)
Loans after net deferred loan fees and costs	795,205	758,094	$ 737,057
Less: Allowance for loan losses	(6,870)	(6,784)		$ (6,057)
Loans - Net	788,335	751,310
Agricultural Real Estate [Member]
Loans:
Loans - Gross	63,603	62,375
Loans after net deferred loan fees and costs	63,571	62,336	59,458
Agricultural [Member]
Loans:
Loans - Gross	87,095	84,563
Loans after net deferred loan fees and costs	87,239	84,692	79,332
Industrial Development Bonds [Member]
Loans:
Loans - Gross	6,555	5,732
Loans after net deferred loan fees and costs	6,555	5,732
Consumer Real Estate [Member]
Loans:
Loans - Gross	84,283	86,234
Loans after net deferred loan fees and costs	83,875	85,873	85,977
Commercial Real Estate [Member]
Loans:
Loans - Gross	394,481	377,481
Loans after net deferred loan fees and costs	393,913	376,887	369,721
Consumer [Member]
Loans:
Loans - Gross	35,843	33,179
Loans after net deferred loan fees and costs	35,887	33,213	$ 30,616
Commercial and Industrial [Member]
Loans:
Loans - Gross	124,078	109,256
Loans after net deferred loan fees and costs	$ 124,165	$ 109,361

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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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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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