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Stock Options, Stock Grants and New Stock (Stock Options by Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding options (shares) | shares 173,985
Number of exercisable options (shares) | shares 88,025
$11.55 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 11.55
Number of Outstanding options (shares) | shares 82,342
Weighted average exercise price (dollars per share) $ 11.55
Weighted average remaining contractual life in years (years) 5 years 23 days
Number of exercisable options (shares) | shares 62,342
Exercisable options, weighted average exercise price (dollars per share) $ 11.55
$11.35 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 11.35
Number of Outstanding options (shares) | shares 25,076
Weighted average exercise price (dollars per share) $ 11.35
Weighted average remaining contractual life in years (years) 6 years 1 month 11 days
Number of exercisable options (shares) | shares 13,184
Exercisable options, weighted average exercise price (dollars per share) $ 11.35
$13.70 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 13.70
Number of Outstanding options (shares) | shares 27,801
Weighted average exercise price (dollars per share) $ 13.70
Weighted average remaining contractual life in years (years) 7 years 1 month 5 days
Number of exercisable options (shares) | shares 10,647
Exercisable options, weighted average exercise price (dollars per share) $ 13.70
$14.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 14.76
Number of Outstanding options (shares) | shares 9,260
Weighted average exercise price (dollars per share) $ 14.76
Weighted average remaining contractual life in years (years) 8 years 1 month 20 days
Number of exercisable options (shares) | shares 1,852
Exercisable options, weighted average exercise price (dollars per share) $ 14.76
$16.01 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 16.01
Number of Outstanding options (shares) | shares 29,506
Weighted average exercise price (dollars per share) $ 16.01
Weighted average remaining contractual life in years (years) 9 years 1 month 10 days
Number of exercisable options (shares) | shares 0
Exercisable options, weighted average exercise price (dollars per share) $ 16.01