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Loans - Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans:
Loans - Gross	$ 847,289	$ 823,771
Less: Net deferred loan fees and costs	(915)	(747)
Loans after net deferred loan fees and costs	846,374	823,024
Less: Allowance for loan losses	(6,775)	(6,868)	$ (6,784)	$ (6,057)
Loans - Net	839,599	816,156
Consumer Real Estate [Member]
Loans:
Loans - Gross	80,766	83,620
Loans after net deferred loan fees and costs	80,232	83,200
Agricultural Real Estate [Member]
Loans:
Loans - Gross	68,609	64,073
Loans after net deferred loan fees and costs	68,588	64,044
Agricultural [Member]
Loans:
Loans - Gross	108,495	95,111
Loans after net deferred loan fees and costs	108,616	95,238
Commercial Real Estate [Member]
Loans:
Loans - Gross	419,784	410,520
Loans after net deferred loan fees and costs	419,131	409,953
Commercial and Industrial [Member]
Loans:
Loans - Gross	121,793	126,275
Loans after net deferred loan fees and costs	121,863	126,372
Consumer [Member]
Loans:
Loans - Gross	41,953	37,757
Loans after net deferred loan fees and costs	42,055	37,802
Industrial Development Bonds [Member]
Loans:
Loans - Gross	5,889	6,415
Loans after net deferred loan fees and costs	$ 5,889	$ 6,415

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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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