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Stock-Based Compensation - Stock-based Compensation Expense (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) year | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) year | Sep. 30, 2020 USD ($)
Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized Stock Compensation Expense | $ 3,287 |  | $ 3,287 |
Weighted average remaining expense period | year | 2.5 |  | 2.5 |
Pre-Tax Expense | $ 270 | $ 108 | $ 495 | $ 582
Post-Tax Expense | 213 | 86 | 391 | 460
Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized Stock Compensation Expense | $ 156 |  | $ 156 |
Weighted average remaining expense period | year | 0.6 |  | 0.6 |
Pre-Tax Expense | $ 66 | 99 | $ 243 | 406
Post-Tax Expense | $ 52 | $ 78 | $ 192 | $ 321

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