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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | $ 10,116 | $ 10,223
Postretirement benefits other than pensions | 311 | 345
Alternative minimum tax credit carryforward | 216 | 201
Unrealized loss on securities available for sale | 3,137 | 2,091
Deferred Tax Assets, Operating Loss Carryforwards | 3,636 | 6,145
Writedown of other real estate owned | 711 | 878
Deferred compensation | 1,426 | 1,514
Accrued interest on nonaccrual loans | 629 | 1,017
Accrued incentives | 2,477 | 1,277
Unfunded loan commitments & other reserves | 1,064 | 1,098
Deferred rent | 799 | 801
Other | 1,486 | 1,224
Total deferred tax assets | 26,008 | 26,814
Deferred tax liabilities: |  |
Income from unconsolidated subsidiary | (11) | (380)
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (1,378) | (587)
Other | (1,053) | (338)
Total deferred tax liabilities | (2,442) | (1,305)
Net deferred tax asset | $ 23,566 | $ 25,509

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