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Loans - Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Loans:
Loans - Gross	$ 791,566	$ 758,820
Less: Net deferred loan fees and costs	(728)	(726)
Loans after net deferred loan fees and costs	790,838	758,094	$ 729,915
Less: Allowance for loan losses	(6,858)	(6,784)		$ (6,057)
Loans - Net	783,980	751,310
Agricultural Real Estate [Member]
Loans:
Loans - Gross	64,035	62,375
Loans after net deferred loan fees and costs	64,003	62,336	60,203
Agricultural [Member]
Loans:
Loans - Gross	83,614	84,563
Loans after net deferred loan fees and costs	83,771	84,692	83,433
Industrial Development Bonds [Member]
Loans:
Loans - Gross	6,617	5,732
Loans after net deferred loan fees and costs	6,617	5,732
Consumer Real Estate [Member]
Loans:
Loans - Gross	84,307	86,234
Loans after net deferred loan fees and costs	83,903	85,873	88,165
Commercial Real Estate [Member]
Loans:
Loans - Gross	394,649	377,481
Loans after net deferred loan fees and costs	394,051	376,887	357,243
Consumer [Member]
Loans:
Loans - Gross	35,394	33,179
Loans after net deferred loan fees and costs	35,435	33,213	$ 30,485
Commercial and Industrial [Member]
Loans:
Loans - Gross	122,950	109,256
Loans after net deferred loan fees and costs	$ 123,058	$ 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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