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Income Taxes - Summary of Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Current – federal | $ 8,265 | $ 7,520 | $ 8,978
Current – state | 499 | 66 | 29
Deferred – federal | (204) | (1,076) | 376
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0 | 0 | 3,009
Income tax expense | $ 8,560 | $ 6,510 | $ 12,392

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