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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 9,561 | $ 10,542
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 25,459 | 25,158
Postretirement benefits other than pensions | 201 | 214
Deferred Tax Assets, Operating Loss Carryforwards | 61 | 51
Deferred compensation | 3,008 | 2,647
Accrued interest on nonaccrual loans | 1,088 | 882
Accrued incentives | 3,295 | 3,299
Unfunded loan commitments & other reserves | 879 | 1,561
Deferred Tax Assets Purchase Accounting Adjustments | 4,001 | 5,490
Other | 744 | 738
Total deferred tax assets | 76,320 | 81,051
Deferred tax liabilities: |  |
Loan origination fees and costs | (2,615) | (1,252)
Deferred Tax Liabilities, Leasing Arrangements | 8,601 | 9,618
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (1,586) | (1,484)
Section 197 intangibles | (3,175) | (2,418)
Deferred Tax Liabilities Purchase Accounting Adjustments | 2,755 | 3,321
Other | (718) | (228)
Total deferred tax liabilities | (19,450) | (18,321)
Net deferred tax asset | 56,870 | 62,730
Unrealized loss on securities available for sale | $ 28,023 | $ 30,469

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