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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Provision for loan losses | $ 13,662 | $ 13,617
Write-downs of other real estate owned | 962 | 915
Deferred compensation | 2,237 | 1,995
Stock-based compensation | 2,934 | 2,707
Investments in partnership interests | 1,170 | 162
Other | 1,479 | 832
Gross deferred tax assets | 22,444 | 20,228
Unrealized net gains on securities | (2,104) | (3,402)
Premium on securities of banks acquired | (800) | (806)
Intangibles | (2,561) | (2,397)
Basis difference related to tax credits | (1,620) | (775)
Depreciation | (5,975) | (4,443)
Leveraged lease | (2,282) | (2,607)
Other | (257) | (507)
Gross deferred tax liabilities | (15,597) | (14,937)
Net deferred tax asset | $ 6,846 | $ 5,291

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