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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred Tax Asset, Tax Deferred Expense, Lease Liability | $ 11,203 | $ 0
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | 10,937 | 10,116
Postretirement benefits other than pensions | 275 | 311
Alternative minimum tax credit carryforward | 216 | 216
Unrealized loss on securities available for sale | 0 | 3,137
Deferred Tax Assets, Operating Loss Carryforwards | 2,017 | 3,636
Writedown of other real estate owned | 48 | 711
Deferred compensation | 1,720 | 1,426
Accrued interest on nonaccrual loans | 710 | 629
Accrued incentives | 2,185 | 2,477
Unfunded loan commitments & other reserves | 964 | 1,064
Deferred rent | 28 | 799
Other | 956 | 1,486
Total deferred tax assets | 31,259 | 26,008
Deferred tax liabilities: |  |
Deferred Tax Liabilities, Leasing Arrangements | 10,302 | 0
Net Unrealized Gain On Investment Securities Available For Sale | 1,386 | 0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (1,470) | (1,378)
Other | (1,239) | (1,064)
Total deferred tax liabilities | (14,397) | (2,442)
Net deferred tax asset | $ 16,862 | $ 23,566

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