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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - Restricted Stock - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based compensation |  |  |  |
Compensation expense before tax | $ 428,000 | $ 312,000 | $ 820,000 | $ 701,000
Compensation expense after tax | 304,000 | $ 217,000 | 592,000 | $ 435,000
Unrecognized compensation expense | $ 3,660,000 |  | $ 3,660,000 |

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