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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Provision for loan losses | $ 13,089 | $ 13,123
Unrealized net losses on securities | 731 | 739
Write-downs of other real estate owned | 462 | 473
Deferred compensation | 2,209 | 2,113
Stock-based compensation | 1,448 | 1,351
Investments in partnership interests | 4,274 | 3,758
Other | 963 | 275
Gross deferred tax assets | 23,176 | 21,832
Premium on securities of banks acquired | (185) | (219)
Intangibles | (5,376) | (3,359)
Basis difference related to tax credits | (2,560) | (2,713)
Depreciation | (8,484) | (4,563)
Leveraged lease |  | (821)
Prepaid expense deducted | (1,178) | (887)
Other | (181) | (180)
Gross deferred tax liabilities | (17,964) | (12,742)
Net deferred tax asset | $ 5,212 | $ 9,090

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