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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 9,581 | $ 9,489
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 21,837 | 19,597
Postretirement benefits other than pensions | 223 | 235
Deferred Tax Assets, Operating Loss Carryforwards | 37 | 75
Deferred compensation | 1,960 | 1,969
Accrued interest on nonaccrual loans | 935 | 779
Accrued incentives | 3,185 | 2,591
Unfunded loan commitments & other reserves | 2,126 | 1,363
Other | 1,205 | 988
Total deferred tax assets | 77,762 | 39,443
Deferred tax liabilities: |  |
Loan origination fees and costs | (1,320) | (253)
Deferred Tax Liabilities, Leasing Arrangements | 8,646 | 8,589
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (2,139) | (1,725)
Section 197 intangibles | (1,717) | (1,107)
Other | (197) | (308)
Total deferred tax liabilities | (14,019) | (11,982)
Net deferred tax asset | 63,743 | 27,461
Unrealized loss on securities available for sale | $ 36,673 | $ 2,357

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