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Allowance for Credit Losses - Summary of Nonaccrual Loans Excluding Purchased Credit-Impaired (PCI) Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	$ 15,192	$ 16,849
Nonaccrual loans without a related ACL	7,488	14,101
Total, Non-Accrual Status	22,680	30,950
Commercial and Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	7,719	8,901
Nonaccrual loans without a related ACL	3,166	3,370
Total, Non-Accrual Status	10,885	12,271
Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	7	36
Nonaccrual loans without a related ACL	2,840
Total, Non-Accrual Status	2,847	36
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	1,194	2,514
Nonaccrual loans without a related ACL		8,000
Total, Non-Accrual Status	1,194	10,514
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	5,040	4,745
Nonaccrual loans without a related ACL	1,482	2,131
Total, Non-Accrual Status	6,522	6,876
Farm Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	401
Total, Non-Accrual Status	401
Lease Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	807	638
Nonaccrual loans without a related ACL		600
Total, Non-Accrual Status	807	1,238
Consumer and Other [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans with a related ACL	24	15
Total, Non-Accrual Status	$ 24	$ 15

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