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Loans - Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans:
Loans - Gross	$ 771,935	$ 758,820
Less: Net deferred loan fees and costs	(729)	(726)
Loans after net deferred loan fees and costs	771,206	758,094	$ 707,660
Less: Allowance for loan losses	(6,850)	(6,784)		$ (6,057)
Loans - Net	764,356	751,310
Agricultural Real Estate [Member]
Loans:
Loans - Gross	62,840	62,375
Loans after net deferred loan fees and costs	62,803	62,336	59,479
Agricultural [Member]
Loans:
Loans - Gross	86,950	84,563
Loans after net deferred loan fees and costs	87,078	84,692	78,021
Industrial Development Bonds [Member]
Loans:
Loans - Gross	5,667	5,732
Loans after net deferred loan fees and costs	5,667	5,732
Consumer Real Estate [Member]
Loans:
Loans - Gross	84,465	86,234
Loans after net deferred loan fees and costs	84,081	85,873	88,097
Commercial Real Estate [Member]
Loans:
Loans - Gross	382,758	377,481
Loans after net deferred loan fees and costs	382,183	376,887	344,661
Consumer [Member]
Loans:
Loans - Gross	33,840	33,179
Loans after net deferred loan fees and costs	33,878	33,213	$ 28,016
Commercial and Industrial [Member]
Loans:
Loans - Gross	115,415	109,256
Loans after net deferred loan fees and costs	$ 115,516	$ 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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