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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 10,542 | $ 9,581
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 25,158 | 21,837
Postretirement benefits other than pensions | 214 | 223
Deferred Tax Assets, Operating Loss Carryforwards | 51 | 37
Deferred compensation | 2,647 | 1,960
Accrued interest on nonaccrual loans | 882 | 935
Accrued incentives | 3,299 | 3,185
Unfunded loan commitments & other reserves | 1,561 | 2,126
Deferred Tax Assets Purchase Accounting Adjustments | 5,490 | 566
Other | 738 | 953
Total deferred tax assets | 81,051 | 78,076
Deferred tax liabilities: |  |
Loan origination fees and costs | (1,252) | (1,320)
Deferred Tax Liabilities, Leasing Arrangements | 9,618 | 8,646
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (1,484) | (2,139)
Section 197 intangibles | (2,418) | (1,717)
Deferred Tax Liabilities Purchase Accounting Adjustments | 3,321 | 314
Other | (228) | (197)
Total deferred tax liabilities | (18,321) | (14,333)
Net deferred tax asset | 62,730 | 63,743
Unrealized loss on securities available for sale | $ 30,469 | $ 36,673

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