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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | $ 17,616 | $ 17,784
Postretirement benefits other than pensions | 611 | 641
Alternative minimum tax credit carryforward | 0 | 5,065
Litigation reserve | 106 | 0
Unrealized loss on securities available for sale | 3,905 | 1,291
Writedown of other real estate owned | 1,266 | 1,087
Deferred compensation | 1,966 | 2,113
Accrued interest on nonaccrual loans | 1,701 | 1,452
Other-than-temporary impairment of securities | 88 | 89
Depreciation of assets | 0 | 879
Accrued incentives | 2,627 | 1,629
Unfunded loan commitment allowance | 1,452 | 1,557
Accrued severance | 102 | 808
Basis difference in assets acquired | 296 | 417
Loan origination fees and costs | 290 | 141
Deferred rent | 1,285 | 1,258
Other | 1,084 | 1,105
Total deferred tax assets | 34,395 | 37,316
Deferred tax liabilities: |  |
Income from unconsolidated subsidiary | (623) | (619)
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (28) | 0
Other | (429) | (337)
Total deferred tax liabilities | (1,080) | (956)
Net deferred tax asset | $ 33,315 | $ 36,360

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