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Stock-based Compensation - RSAs & Performance-Based RSUs (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
RSAs  
Number of shares  
Beginning balance (in shares) | shares 51,561
Granted (in shares) | shares 49,960
Vested (in shares) | shares (28,402)
Forfeited (in shares) | shares 0
Ending balance (in shares) | shares 73,119
Weighted average price at grant  
Beginning balance (in dollars per share) | $ / shares $ 50.92
Granted (in dollars per share) | $ / shares 53.84
Vested (in dollars per share) | $ / shares 50.16
Forfeited (in dollars per share) | $ / shares 0
Ending balance (in dollars per share) | $ / shares $ 53.22
RSUs  
Number of shares  
Beginning balance (in shares) | shares 87,787
Granted (in shares) | shares 31,749
Performance criteria adjustment (in shares) | shares 12,257
Vested (in shares) | shares (38,897)
Forfeited (in shares) | shares (1,954)
Ending balance (in shares) | shares 90,942
Weighted average price at grant  
Beginning balance (in dollars per share) | $ / shares $ 46.62
Granted (in dollars per share) | $ / shares 53.96
Performance criteria adjustment (in dollars per share) | $ / shares 52.96
Vested (in dollars per share) | $ / shares 52.96
Forfeited (in dollars per share) | $ / shares 35.40
Ending balance (in dollars per share) | $ / shares $ 52.71