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Employee Benefit Plans - Stock Transactions - Stock Options Outstanding And Exercisable (Details)
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range  
Options outstanding (in shares) | shares 723,202
Options outstanding, Weighted average remaining contractual life (in years) 7 years
Options outstanding, Weighted average exercise price (in dollars per share) $ 17.22
Options exercisable (in shares) | shares 447,048
Options exercisable, Weighted average exercise price (in dollars per share) $ 15.58
$0.00 - $6.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range  
Range of exercise prices, lower 0.00
Range of exercise prices, upper $ 6.00
Options outstanding (in shares) | shares 19,869
Options outstanding, Weighted average remaining contractual life (in years) 1 year 7 months 6 days
Options outstanding, Weighted average exercise price (in dollars per share) $ 5.47
Options exercisable (in shares) | shares 19,869
Options exercisable, Weighted average exercise price (in dollars per share) $ 5.47
$6.01 - $12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range  
Range of exercise prices, lower 6.01
Range of exercise prices, upper $ 12.00
Options outstanding (in shares) | shares 135,800
Options outstanding, Weighted average remaining contractual life (in years) 3 years 10 months 24 days
Options outstanding, Weighted average exercise price (in dollars per share) $ 8.85
Options exercisable (in shares) | shares 135,800
Options exercisable, Weighted average exercise price (in dollars per share) $ 8.86
$12.01 - $18.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range  
Range of exercise prices, lower 12.01
Range of exercise prices, upper $ 18.00
Options outstanding (in shares) | shares 132,533
Options outstanding, Weighted average remaining contractual life (in years) 7 years 7 months 6 days
Options outstanding, Weighted average exercise price (in dollars per share) $ 16.37
Options exercisable (in shares) | shares 69,201
Options exercisable, Weighted average exercise price (in dollars per share) $ 15.72
$18.01 - $24.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range  
Range of exercise prices, lower 18.01
Range of exercise prices, upper $ 24.00
Options outstanding (in shares) | shares 435,000
Options outstanding, Weighted average remaining contractual life (in years) 8 years
Options outstanding, Weighted average exercise price (in dollars per share) $ 20.62
Options exercisable (in shares) | shares 222,178
Options exercisable, Weighted average exercise price (in dollars per share) $ 20.56