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Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding stock options, number (in shares) | shares 77,461
Outstanding stock option, weighted average exercise price (in dollars per share) $ 11.85
Outstanding stock option, weighted average remaining contractual life 3 years 8 months 11 days
Exercisable stock options, number (in shares) | shares 74,962
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 11.82
Exercisable stock options, weighted average remaining contractual life 3 years 7 months 15 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 $ 9.00
Exercise price range, upper range limit $ 10.99
Outstanding stock options, number (in shares) | shares 17,633
Outstanding stock option, weighted average exercise price (in dollars per share) $ 9.00
Outstanding stock option, weighted average remaining contractual life 2 years 9 months 27 days
Exercisable stock options, number (in shares) | shares 17,633
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 9.00
Exercisable stock options, weighted average remaining contractual life 2 years 9 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 $ 11.00
Exercise price range, upper range limit $ 12.99
Outstanding stock options, number (in shares) | shares 53,266
Outstanding stock option, weighted average exercise price (in dollars per share) $ 12.04
Outstanding stock option, weighted average remaining contractual life 4 years 4 months 1 day
Exercisable stock options, number (in shares) | shares 50,767
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 12.02
Exercisable stock options, weighted average remaining contractual life 4 years 3 months 4 days
Exercise Price Range 17.00 to 18.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 17.00
Exercise price range, upper range limit $ 18.99
Outstanding stock options, number (in shares) | shares 6,562
Outstanding stock option, weighted average exercise price (in dollars per share) $ 17.88
Outstanding stock option, weighted average remaining contractual life 10 months 7 days
Exercisable stock options, number (in shares) | shares 6,562
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 17.88
Exercisable stock options, weighted average remaining contractual life 10 months 7 days