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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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