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Loans - Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans:
Loans - Gross	$ 686,516	$ 622,345
Less: Net deferred loan fees and costs	(638)	(419)
Loans after net deferred loan fees and costs	685,878	621,926
Less: Allowance for loan losses	(6,057)	(5,905)	$ (5,194)	$ (5,224)
Loans - Net	679,821	616,021
Agricultural Real Estate [Member]
Loans:
Loans - Gross	58,525	50,895
Loans after net deferred loan fees and costs	58,463	50,895
Agricultural [Member]
Loans:
Loans - Gross	82,654	74,611
Loans after net deferred loan fees and costs	82,762	74,611
Industrial Development Bonds [Member]
Loans:
Loans - Gross	6,491	4,698
Loans after net deferred loan fees and costs	6,491	4,698
Consumer Real Estate [Member]
Loans:
Loans - Gross	88,189	97,550
Loans after net deferred loan fees and costs	87,947	97,550
Commercial Real Estate [Member]
Loans:
Loans - Gross	322,762	270,188
Loans after net deferred loan fees and costs	322,230	270,188
Consumer [Member]
Loans:
Loans - Gross	27,770	24,277
Loans after net deferred loan fees and costs	27,787	23,858
Commercial and Industrial [Member]
Loans:
Loans - Gross	100,125	100,126
Loans after net deferred loan fees and costs	$ 100,198	$ 100,126

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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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