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Stock-Based Compensation - Stock-based Compensation Expense (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) year | Mar. 31, 2020 USD ($)
Employee |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Unrecognized Stock Compensation Expense | $ 1,753 |
Weighted average remaining expense period | year | 2.1 |
Pre-Tax Expense | $ 163 | $ 526
Post-Tax Expense | 129 | 416
Director |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Unrecognized Stock Compensation Expense | $ 38 |
Weighted average remaining expense period | year | 0.1 |
Pre-Tax Expense | $ 97 | 174
Post-Tax Expense | $ 77 | $ 137

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