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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Loans:
Loans - Gross	$ 1,160,141	$ 847,289
Less: Net deferred loan fees and costs	(1,445)	(915)
Loans after net deferred loan fees and costs	1,158,696	846,374	$ 838,698
Less: Allowance for loan losses	(6,759)	(6,775)		$ (6,868)
Loans - Net	1,151,937	839,599
Consumer Real Estate [Member]
Loans:
Loans - Gross	159,074	80,766
Loans after net deferred loan fees and costs	158,458	80,232	82,629
Agricultural Real Estate [Member]
Loans:
Loans - Gross	200,791	68,609
Loans after net deferred loan fees and costs	200,625	68,588	68,524
Agricultural [Member]
Loans:
Loans - Gross	110,270	108,495
Loans after net deferred loan fees and costs	110,405	108,616	103,760
Commercial Real Estate [Member]
Loans:
Loans - Gross	502,137	419,784
Loans after net deferred loan fees and costs	501,095	419,131	416,632
Commercial and Industrial [Member]
Loans:
Loans - Gross	130,150	121,793
Loans after net deferred loan fees and costs	130,228	121,863
Consumer [Member]
Loans:
Loans - Gross	49,552	41,953
Loans after net deferred loan fees and costs	49,718	42,055	$ 41,541
Other Loan [Member]
Loans:
Loans - Gross	8,167	5,889
Loans after net deferred loan fees and costs	$ 8,167	$ 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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