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Loans - Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Loans:
Loans - Gross	$ 1,349,179	$ 1,220,765
Less: Net deferred loan fees and costs	(4,456)	(1,766)
Loans after net deferred loan fees and costs	1,344,723	1,218,999	$ 1,091,131
Less: Allowance for loan losses	(9,933)	(7,228)		$ (6,775)
Loans - Net	1,334,790	1,211,771
Consumer Real Estate [Member]
Loans:
Loans - Gross	174,069	165,349
Loans after net deferred loan fees and costs	173,615	164,691	158,957
Agricultural Real Estate [Member]
Loans:
Loans - Gross	194,606	199,105
Loans after net deferred loan fees and costs	194,310	198,859	193,616
Agricultural [Member]
Loans:
Loans - Gross	107,458	111,820
Loans after net deferred loan fees and costs	107,615	111,949	113,906
Commercial Real Estate [Member]
Loans:
Loans - Gross	589,382	551,309
Loans after net deferred loan fees and costs	588,176	550,082	442,538
Commercial and Industrial [Member]
Loans:
Loans - Gross	223,842	135,631
Loans after net deferred loan fees and costs	221,034	135,695
Consumer [Member]
Loans:
Loans - Gross	50,108	49,237
Loans after net deferred loan fees and costs	50,259	49,409	$ 49,100
Other Loan [Member]
Loans:
Loans - Gross	9,714	8,314
Loans after net deferred loan fees and costs	$ 9,714	$ 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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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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