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Stock-Based Compensation (Stock Options) - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options exercisable contractual term |  |  |  | 10 years |  |
Tax benefits realized |  |  | $ (3) | $ 71 | $ 85 |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Recognized compensation expenses |  | $ 300 | 222 | 880 | 647 |
Deferred tax benefits recognized |  | 19 | $ 18 | 57 | $ 57 |
Unrecognized compensation expense related to nonvested stock options |  | $ 2,189 |  | $ 2,189 |  | $ 1,835
Tax benefits realized | $ (3) |  |  |  |  |
Recognition of remaining compensation expense over a weighted-average period |  |  |  | 2 years 6 months |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options maximum vesting period |  |  |  | 5 years |  |

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