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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | $ 10,223 | $ 17,616
Postretirement benefits other than pensions | 345 | 611
Alternative minimum tax credit carryforward | 201 | 0
Unrealized loss on securities available for sale | 2,091 | 3,905
Deferred Tax Assets, Operating Loss Carryforwards | 6,145 | 0
Writedown of other real estate owned | 878 | 1,266
Deferred compensation | 1,514 | 1,966
Accrued interest on nonaccrual loans | 1,017 | 1,701
Accrued incentives | 1,277 | 2,627
Unfunded loan commitments & other reserves | 1,098 | 1,452
Deferred rent | 801 | 1,285
Other | 1,224 | 1,966
Total deferred tax assets | 26,814 | 34,395
Deferred tax liabilities: |  |
Income from unconsolidated subsidiary | (380) | (623)
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (587) | (28)
Other | (338) | (429)
Total deferred tax liabilities | (1,305) | (1,080)
Net deferred tax asset | $ 25,509 | $ 33,315

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