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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - Restricted Stock - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation |  |  |  |
Compensation expense before tax | $ 386,000 | $ 311,000 | $ 1,210,000 | $ 1,010,000.00
Compensation expense after tax | 271,000 | $ 219,000 | 863,000 | $ 654,000
Unrecognized compensation expense | $ 3,180,000 |  | $ 3,180,000 |

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