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Loans - Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Loans:
Loans - Gross	$ 2,517,701		$ 2,357,903
Less: Net deferred loan fees and costs	(1,908)		(1,516)
Loans after net deferred loan fees and costs	2,515,793		2,356,387	$ 2,034,818
Less: Allowance for loan losses	(24,910)	$ (24,634)	(20,313)
Loans - Net	2,490,883		2,336,074
Consumer Real Estate [Member]
Loans:
Loans - Gross	506,866		494,423
Loans after net deferred loan fees and costs	506,842		494,423	410,468
Less: Allowance for loan losses	(3,998)	(3,623)	(998)
Agricultural Real Estate [Member]
Loans:
Loans - Gross	230,837		220,819
Loans after net deferred loan fees and costs	230,531		220,514	199,650
Less: Allowance for loan losses	(237)	(209)	(349)
Agricultural [Member]
Loans:
Loans - Gross	128,344		128,733
Loans after net deferred loan fees and costs	128,593		128,926	127,340
Less: Allowance for loan losses	(107)	(66)	(751)
Commercial Real Estate [Member]
Loans:
Loans - Gross	1,280,902		1,152,603
Loans after net deferred loan fees and costs	1,278,445		1,150,511	977,588
Less: Allowance for loan losses	(16,681)	(16,088)	(11,924)
Commercial and Industrial [Member]
Loans:
Loans - Gross	253,444		242,360
Loans after net deferred loan fees and costs			242,301
Consumer [Member]
Loans:
Loans - Gross	88,312		89,147
Loans after net deferred loan fees and costs	89,138		89,894	$ 55,648
Less: Allowance for loan losses	(1,120)	$ (1,234)	(909)
Other Loan [Member]
Loans:
Loans - Gross	$ 28,996		29,818
Loans after net deferred loan fees and costs			$ 29,818

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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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