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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 9,928 | $ 11,203
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 21,483 | 10,937
Postretirement benefits other than pensions | 242 | 275
Alternative minimum tax credit carryforward | 0 | 216
Deferred Tax Assets, Operating Loss Carryforwards | 385 | 2,017
Deferred compensation | 1,723 | 1,720
Accrued interest on nonaccrual loans | 644 | 710
Accrued incentives | 2,182 | 2,185
Unfunded loan commitments & other reserves | 1,576 | 964
Other | 1,831 | 1,032
Total deferred tax assets | 39,994 | 31,259
Deferred tax liabilities: |  |
Loan origination fees and costs | (1,280) | (626)
Deferred Tax Liabilities, Leasing Arrangements | 9,037 | 10,302
Net Unrealized Gain On Investment Securities Available For Sale | 4,629 | 1,386
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (2,103) | (1,470)
Section 197 intangibles | (540) | (45)
Other | (424) | (568)
Total deferred tax liabilities | (18,013) | (14,397)
Net deferred tax asset | $ 21,981 | $ 16,862

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