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Loans - Loans (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans:
Loans - Gross	$ 1,859,157,000	$ 1,305,473,000
Less: Net deferred loan fees and costs	(1,738,000)	(2,483,000)
Loans after net deferred loan fees and costs	1,857,419,000	1,302,990,000
Less: Allowance for loan losses	(16,242,000)	(13,672,000)	$ (7,228,000)	$ (6,775,000)
Loans - Net	1,841,177,000	1,289,318,000
Consumer Real Estate [Member]
Loans:
Loans - Gross	395,873,000	175,588,000
Loans after net deferred loan fees and costs	395,805,000	175,316,000
Agricultural Real Estate [Member]
Loans:
Loans - Gross	198,343,000	189,159,000
Loans after net deferred loan fees and costs	198,033,000	188,826,000
Agricultural [Member]
Loans:
Loans - Gross	118,368,000	94,358,000
Loans after net deferred loan fees and costs	118,504,000	94,490,000
Commercial Real Estate [Member]
Loans:
Loans - Gross	848,477,000	588,825,000
Loans after net deferred loan fees and costs	847,110,000	587,654,000
Commercial and Industrial [Member]
Loans:
Loans - Gross	208,270,000	189,246,000
Loans after net deferred loan fees and costs	208,049,000	188,286,000
Less: Allowance for loan losses	0
Consumer [Member]
Loans:
Loans - Gross	57,737,000	52,540,000
Loans after net deferred loan fees and costs	57,829,000	52,661,000
Other Loan [Member]
Loans:
Loans - Gross	32,089,000	15,757,000
Loans after net deferred loan fees and costs	$ 32,089,000	$ 15,757,000

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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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