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Stock-Based Compensation Plans - Restricted stock activity (Details) - Restricted Stock
6 Months Ended
Jun. 30, 2021
shares
Number Outstanding  
Balance at the beginning of the period (in shares) 581,715
Shares granted (in shares) 286,550
Shares forfeited (in shares) 0
Shares vested (in shares) (339,657)
Balance at the end of the period (in shares) 528,608