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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 9,489 | $ 9,928
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 19,597 | 21,483
Postretirement benefits other than pensions | 235 | 242
Deferred Tax Assets, Operating Loss Carryforwards | 75 | 385
Deferred compensation | 1,969 | 1,723
Accrued interest on nonaccrual loans | 779 | 644
Accrued incentives | 2,591 | 2,182
Unfunded loan commitments & other reserves | 1,363 | 1,576
Other | 988 | 1,831
Total deferred tax assets | 39,443 | 39,994
Deferred tax liabilities: |  |
Loan origination fees and costs | (253) | (1,280)
Deferred Tax Liabilities, Leasing Arrangements | 8,589 | 9,037
Net Unrealized Gain On Investment Securities Available For Sale | 0 | 4,629
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (1,725) | (2,103)
Section 197 intangibles | (1,107) | (540)
Other | (308) | (424)
Total deferred tax liabilities | (11,982) | (18,013)
Net deferred tax asset | 27,461 | 21,981
Unrealized loss on securities available for sale | $ 2,357 | $ 0

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