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Stock Option Plan - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 15, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 689,000 | $ 684,000 | $ 779,000
Income tax benefits recognized |  | 161,000 | $ 202,000 | $ 246,000
Unamortized restricted stock compensation |  | $ 691,000 |  |
Stock options granted |  | 76,500 | 0 | 0
Total unrecognized compensation cost |  | $ 332,000 |  |
Unrecognized compensation costs, weighted-average recognition period |  | 2 years |  |
Option exercised of intrinsic value |  | $ 1,200,000 | $ 13,600,000 | $ 2,800,000
Total fair of share vested |  | $ 460,000 | $ 734,000 | $ 930,000
Number of nonvested stock options |  | 76,500 | 62,008 | 163,996
Weighted average grant date fair value, nonvested stock options |  | $ 6.32 | $ 6.48 | $ 6.53
Stock options exercised, shares |  | 200,629 |  |
Stock options exercised |  | $ 2,817,000 | $ 9,629,000 | $ 2,296,000
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Number of units granted | 43,425 | 0 |  | 0
Closing price of units granted | $ 29.38 |  |  |
Number of units vested |  | 14,475 |  |
Number of remaining unvested units |  | 28,950 |  |
Weighted average grant price |  | $ 29.38 |  |
Intrinsic value of vested stock |  | $ 262,000 |  |
2017 Omnibus Stock Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option expiration period from date of grant |  | 10 years |  |
Vesting period |  | 3 years |  |
Number of shares available for future grant |  | 1,254,045 |  |
Maximum | 2017 Omnibus Stock Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of option to purchase number of outstanding common stock |  | 30.00% |  |
Percentage of fair market value stock on date of the grant |  | 100.00% |  |

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