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Employee Benefit Plans - Stock Transactions - Restricted Stock Awards (Details) - Restricted Stock - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award    
Number of shares granted (in shares) 30,000 15,000
Average grant date fair value (in usd per share) $ 19.46 $ 16.63