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Employee Benefit Plans - Stock Transactions - Stock Options Outstanding And Exercisable (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding (in shares) | shares 581,411
Options Outstanding: Weighted Average Remaining Contractual Life 7 years 1 month 6 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share) $ 14.21
Options Exercisable: Shares Exercisable (in shares) | shares 342,889
Options Exercisable: Weighted Average Exercise Price (in dollars per share) $ 10.32
$0.00 - $6.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 0.00
Range of exercise prices, upper (in dollars per share) $ 6.00
Options Outstanding: Shares Outstanding (in shares) | shares 61,761
Options Outstanding: Weighted Average Remaining Contractual Life 3 years 2 months 12 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share) $ 5.60
Options Exercisable: Shares Exercisable (in shares) | shares 61,761
Options Exercisable: Weighted Average Exercise Price (in dollars per share) $ 5.60
$6.01 - $12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 6.01
Range of exercise prices, upper (in dollars per share) $ 12.00
Options Outstanding: Shares Outstanding (in shares) | shares 198,617
Options Outstanding: Weighted Average Remaining Contractual Life 5 years 8 months 12 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share) $ 8.71
Options Exercisable: Shares Exercisable (in shares) | shares 198,617
Options Exercisable: Weighted Average Exercise Price (in dollars per share) $ 8.71
$12.01 - $18.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 12.01
Range of exercise prices, upper (in dollars per share) $ 18.00
Options Outstanding: Shares Outstanding (in shares) | shares 70,533
Options Outstanding: Weighted Average Remaining Contractual Life 7 years 7 months 6 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share) $ 15.73
Options Exercisable: Shares Exercisable (in shares) | shares 46,335
Options Exercisable: Weighted Average Exercise Price (in dollars per share) $ 15.73
$18.01 - $24.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 18.01
Range of exercise prices, upper (in dollars per share) $ 24.00
Options Outstanding: Shares Outstanding (in shares) | shares 250,500
Options Outstanding: Weighted Average Remaining Contractual Life 9 years 1 month 6 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share) $ 20.26
Options Exercisable: Shares Exercisable (in shares) | shares 36,176
Options Exercisable: Weighted Average Exercise Price (in dollars per share) $ 20.27