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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Loans:
Loans - Gross	$ 1,367,847	$ 1,220,765
Less: Net deferred loan fees and costs	(3,985)	(1,766)
Loans after net deferred loan fees and costs	1,363,862	1,218,999	$ 1,158,696
Less: Allowance for loan losses	(11,883)	(7,228)		$ (6,775)
Loans - Net	1,351,979	1,211,771
Consumer Real Estate [Member]
Loans:
Loans - Gross	175,963	165,349
Loans after net deferred loan fees and costs	175,595	164,691	158,458
Agricultural Real Estate [Member]
Loans:
Loans - Gross	192,883	199,105
Loans after net deferred loan fees and costs	192,577	198,859	200,625
Agricultural [Member]
Loans:
Loans - Gross	103,330	111,820
Loans after net deferred loan fees and costs	103,476	111,949	110,405
Commercial Real Estate [Member]
Loans:
Loans - Gross	595,146	551,309
Loans after net deferred loan fees and costs	593,936	550,082	501,095
Commercial and Industrial [Member]
Loans:
Loans - Gross	238,175	135,631
Loans after net deferred loan fees and costs	235,793	135,695
Consumer [Member]
Loans:
Loans - Gross	53,320	49,237
Loans after net deferred loan fees and costs	53,455	49,409	$ 49,718
Other Loan [Member]
Loans:
Loans - Gross	9,030	8,314
Loans after net deferred loan fees and costs	$ 9,030	$ 8,314

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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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