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Loans - Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans:
Loans - Gross	$ 760,875	$ 686,516
Less: Net deferred loan fees and costs	(726)	(638)
Loans after net deferred loan fees and costs	760,149	685,878
Less: Allowance for loan losses	(6,784)	(6,057)	$ (5,905)	$ (5,194)
Loans - Net	753,365	679,821
Agricultural Real Estate [Member]
Loans:
Loans - Gross	63,391	58,525
Loans after net deferred loan fees and costs	63,352	58,463
Agricultural [Member]
Loans:
Loans - Gross	84,563	82,654
Loans after net deferred loan fees and costs	84,692	82,762
Industrial Development Bonds [Member]
Loans:
Loans - Gross	5,732	6,491
Loans after net deferred loan fees and costs	5,732	6,491
Consumer Real Estate [Member]
Loans:
Loans - Gross	87,273	88,189
Loans after net deferred loan fees and costs	86,912	87,947
Commercial Real Estate [Member]
Loans:
Loans - Gross	377,481	322,762
Loans after net deferred loan fees and costs	376,887	322,230
Consumer [Member]
Loans:
Loans - Gross	33,179	27,770
Loans after net deferred loan fees and costs	33,213	27,787
Commercial and Industrial [Member]
Loans:
Loans - Gross	109,256	100,125
Loans after net deferred loan fees and costs	$ 109,361	$ 100,198

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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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