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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense | $ 4,014 | $ 4,020 | $ 3,668 | $ 3,215 | $ 4,969 | $ 3,987 | $ 3,316 | $ 2,502 | $ 14,917 | $ 14,774 | $ 9,137
Federal income tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Cumulative pre-tax book income position period |  |  |  |  |  |  |  |  | 3 years | 3 years |
Taxable income generation period |  |  |  |  |  |  |  |  | 2 years |  |
State net operating loss carryforward | $ 1,200 |  |  |  | $ 600 |  |  |  | $ 1,200 | $ 600 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
State net operating loss carryforwards expiration period |  |  |  |  |  |  |  |  | 2030 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
State net operating loss carryforwards expiration period |  |  |  |  |  |  |  |  | 2035 |  |

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