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Loans - Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Loans:
Loans - Gross	$ 1,092,222	$ 847,289
Less: Net deferred loan fees and costs	(1,091)	(915)
Loans after net deferred loan fees and costs	1,091,131	846,374	$ 831,015
Less: Allowance for loan losses	(6,683)	(6,775)		$ (6,868)
Loans - Net	1,084,448	839,599
Consumer Real Estate [Member]
Loans:
Loans - Gross	159,540	80,766
Loans after net deferred loan fees and costs	158,957	80,232	82,368
Agricultural Real Estate [Member]
Loans:
Loans - Gross	193,768	68,609
Loans after net deferred loan fees and costs	193,616	68,588	69,676
Agricultural [Member]
Loans:
Loans - Gross	113,755	108,495
Loans after net deferred loan fees and costs	113,906	108,616	104,980
Commercial Real Estate [Member]
Loans:
Loans - Gross	443,257	419,784
Loans after net deferred loan fees and costs	442,538	419,131	410,886
Commercial and Industrial [Member]
Loans:
Loans - Gross	125,609	121,793
Loans after net deferred loan fees and costs	125,673	121,863
Consumer [Member]
Loans:
Loans - Gross	48,952	41,953
Loans after net deferred loan fees and costs	49,100	42,055	$ 40,595
Other Loan [Member]
Loans:
Loans - Gross	7,341	5,889
Loans after net deferred loan fees and costs	$ 7,341	$ 5,889

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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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