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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - Restricted Stock - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based compensation    
Compensation expense before tax $ 511,000 $ 392,000
Compensation expense after tax 365,000 $ 287,000
Unrecognized compensation expense $ 3,950,000