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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Provision for loan losses | $ 13,123 | $ 18,748
Unrealized net losses on securities | 739 |
Write-downs of other real estate owned | 473 | 769
Deferred compensation | 2,113 | 3,197
Stock-based compensation | 1,351 | 2,441
Investments in partnership interests | 3,758 | 4,603
Other | 275 | 666
Gross deferred tax assets | 21,832 | 30,424
Unrealized net gains on securities |  | (59)
Premium on securities of banks acquired | (219) | (453)
Intangibles | (3,359) | (5,365)
Basis difference related to tax credits | (2,713) | (3,435)
Depreciation | (4,563) | (6,758)
Leveraged lease | (821) | (1,408)
Prepaid expense deducted | (887) |
Other | (180) | (271)
Gross deferred tax liabilities | (12,742) | (17,749)
Net deferred tax asset | $ 9,090 | $ 12,675

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