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Stock-Based Compensation - Stock-based Compensation Expense (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) year | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) year | Jun. 30, 2020 USD ($)
Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized Stock Compensation Expense | $ 2,453 |  | $ 2,453 |
Weighted average remaining expense period | year | 2.3 |  | 2.3 |
Pre-Tax Expense | $ 62 | $ (52) | $ 225 | $ 474
Post-Tax Expense | 49 | (41) | 178 | 374
Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized Stock Compensation Expense | $ 223 |  | $ 223 |
Weighted average remaining expense period | year | 0.8 |  | 0.8 |
Pre-Tax Expense | $ 80 | 133 | $ 177 | 307
Post-Tax Expense | $ 63 | $ 105 | $ 140 | $ 243

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