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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for credit losses | $ 17,784 | $ 18,218
Postretirement benefits other than pensions | 641 | 679
Alternative minimum tax credit carryforward | 5,065 | 8,627
Litigation reserve | 0 | 3,000
Unrealized loss on securities available for sale | 1,291 | 2,463
Writedown of other real estate owned | 1,087 | 603
Deferred compensation | 2,113 | 2,246
Accrued interest on nonaccrual loans | 1,452 | 1,059
Other-than-temporary impairment of securities | 89 | 9,239
Depreciation of assets | 879 | 1,127
Accrued incentives | 1,629 | 1,594
Unfunded loan commitment allowance | 1,557 | 1,078
Accrued severance | 808 | 160
Basis difference in assets acquired | 417 | 0
Loan origination fees and costs | 141 | 0
Deferred rent | 1,258 | 969
Other | 1,105 | 1,194
Total deferred tax assets | 37,316 | 52,256
Deferred tax liabilities: |  |
Basis difference in assets acquired | 0 | (344)
Loan origination fees and costs | 0 | (1,337)
Income from unconsolidated subsidiary | (619) | (603)
Other | (337) | (318)
Total deferred tax liabilities | (956) | (2,602)
Net deferred tax asset | $ 36,360 | $ 49,654

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