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Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding stock options, number (in shares) | shares 20,265
Outstanding stock option, weighted average exercise price (in dollars per share) $ 11.42
Outstanding stock option, weighted average remaining contractual life (years) 2 years 9 months 22 days
Exercisable stock options, number (in shares) | shares 20,265
Exercisable stock option, weighted average exercise price (in dollars per share) $ 11.42
Exercisable stock options, weighted average remaining contractual life (years) 2 years 9 months 22 days
Exercise Price Range, 9.00 to 10.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit (usd per share) $ 9.00
Exercise price range, upper range limit (usd per share) $ 10.99
Outstanding stock options, number (in shares) | shares 4,356
Outstanding stock option, weighted average exercise price (in dollars per share) $ 9.00
Outstanding stock option, weighted average remaining contractual life (years) 1 year 6 months 27 days
Exercisable stock options, number (in shares) | shares 4,356
Exercisable stock option, weighted average exercise price (in dollars per share) $ 9.00
Exercisable stock options, weighted average remaining contractual life (years) 1 year 6 months 27 days
Exercise Price Range 11.00 to 12.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit (usd per share) $ 11.00
Exercise price range, upper range limit (usd per share) $ 12.99
Outstanding stock options, number (in shares) | shares 15,909
Outstanding stock option, weighted average exercise price (in dollars per share) $ 12.08
Outstanding stock option, weighted average remaining contractual life (years) 3 years 1 month 24 days
Exercisable stock options, number (in shares) | shares 15,909
Exercisable stock option, weighted average exercise price (in dollars per share) $ 12.08
Exercisable stock options, weighted average remaining contractual life (years) 3 years 1 month 24 days