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Loans - Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Loans:
Loans - Gross	$ 732,364	$ 686,516
Less: Net deferred loan fees and costs	(673)	(638)
Loans after net deferred loan fees and costs	731,691	685,878	$ 620,591
Less: Allowance for loan losses	(6,493)	(6,057)		$ (5,905)
Loans - Net	725,198	679,821
Agricultural Real Estate [Member]
Loans:
Loans - Gross	61,403	58,525
Loans after net deferred loan fees and costs	61,353	58,463	52,614
Agricultural [Member]
Loans:
Loans - Gross	83,287	82,654
Loans after net deferred loan fees and costs	83,433	82,762	74,352
Industrial Development Bonds [Member]
Loans:
Loans - Gross	5,952	6,491
Loans after net deferred loan fees and costs	5,952	6,491
Consumer Real Estate [Member]
Loans:
Loans - Gross	89,090	88,189
Loans after net deferred loan fees and costs	88,791	87,947	86,641
Commercial Real Estate [Member]
Loans:
Loans - Gross	357,838	322,762
Loans after net deferred loan fees and costs	357,243	322,230	279,002
Consumer [Member]
Loans:
Loans - Gross	30,458	27,770
Loans after net deferred loan fees and costs	30,485	27,787	$ 25,160
Commercial and Industrial [Member]
Loans:
Loans - Gross	104,336	100,125
Loans after net deferred loan fees and costs	$ 104,434	$ 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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