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Employee Benefit Plans (Schedule of Stock Options, by Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 504,573
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 5 years 8 months 12 days
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 8.31
Options Exercisable: Shares Exercisable | shares 351,648
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 6.53
0.00 - 4.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 77,000
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 1 year 1 month 6 days
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 3.51
Options Exercisable: Shares Exercisable | shares 77,000
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 3.51
0.00 - 4.00 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower 0
0.00 - 4.00 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, upper $ 4
4.01 - 8.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 186,340
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 4 years 6 months
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 6.20
Options Exercisable: Shares Exercisable | shares 186,340
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 6.20
4.01 - 8.00 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower 4.01
4.01 - 8.00 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, upper $ 8
8.01 - 12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 164,633
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 7 years 9 months 18 days
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 9.51
Options Exercisable: Shares Exercisable | shares 78,471
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 9.27
8.01 - 12.00 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower 8.01
8.01 - 12.00 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, upper $ 12
12.01 - 16.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 46,600
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 9 years
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 15.00
Options Exercisable: Shares Exercisable | shares 9,837
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 14.60
12.01 - 16.00 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower 12.01
12.01 - 16.00 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, upper $ 16
16.01 - 20.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding: Shares Outstanding | shares 30,000
Options Outstanding: Weighted Average Remaining Contractual Life (in years) 9 years 2 months 12 days
Options Outstanding: Weighted Average Exercise Price (in usd per share) $ 16.75
Options Exercisable: Shares Exercisable | shares 0
Options Exercisable: Weighted Average Exercise Price (in usd per share) $ 0.00
16.01 - 20.00 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower 16.01
16.01 - 20.00 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, upper $ 20