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Loans - Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans:
Loans - Gross	$ 1,220,765	$ 847,289
Less: Net deferred loan fees and costs	(1,766)	(915)
Loans after net deferred loan fees and costs	1,218,999	846,374
Less: Allowance for loan losses	(7,228)	(6,775)	$ (6,868)	$ (6,784)
Loans - Net	1,211,771	839,599
Consumer Real Estate [Member]
Loans:
Loans - Gross	165,349	80,766
Loans after net deferred loan fees and costs	164,691	80,232
Agricultural Real Estate [Member]
Loans:
Loans - Gross	199,105	68,609
Loans after net deferred loan fees and costs	198,859	68,588
Agricultural [Member]
Loans:
Loans - Gross	111,820	108,495
Loans after net deferred loan fees and costs	111,949	108,616
Commercial Real Estate [Member]
Loans:
Loans - Gross	551,309	419,784
Loans after net deferred loan fees and costs	550,082	419,131
Commercial and Industrial [Member]
Loans:
Loans - Gross	135,631	121,793
Loans after net deferred loan fees and costs	135,695	121,863
Consumer [Member]
Loans:
Loans - Gross	49,237	41,953
Loans after net deferred loan fees and costs	49,409	42,055
Other Loan [Member]
Loans:
Loans - Gross	$ 8,314	$ 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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