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Stock Options (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Apr. 05, 2012
Stock options under 2012 Plan      
Stock option details      
Shares available for future grants 186,250   800,000
Maximum exercisable period for options granted 10 years    
Stock option activity      
Options outstanding at the beginning of the period (in shares) 871,727    
Plus: Options granted (in shares) 4,000    
Less:      
Options exercised (in shares) 9,725    
Options forfeited (in shares) 14,000    
Options outstanding at the end of the period (in shares) 852,002    
Options fully vested and exercisable at the end of the period (in shares) 251,983    
Stock options, weighted average exercise price      
Options outstanding at the beginning, weighted average exercise price (in dollars per share) $ 19.08    
Plus: Options granted, weighted average exercise price (in dollars per share) 22.07    
Less:      
Options exercised, weighted average exercise price (in dollars per share) 11.55    
Options expired, weighted average exercise price (in dollars per share) 0.00    
Options forfeited, weighted average exercise price (in dollars per share) 20.97    
Options outstanding at the end, weighted average exercise price (in dollars per share) 19.15    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 15.53    
Stock options, weighted average remaining contractual term      
Options outstanding at the end, weighted average remaining contractual term 6 years 5 months 16 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term 4 years 1 month 13 days    
Stock options, aggregate intrinsic value      
Options outstanding at the end, aggregate intrinsic value $ 4,699,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 2,299,000    
Stock-based compensation expense 285,000 $ 292,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 3,078,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition 2 years    
Incentive stock options granted to 10% shareholders      
Stock option details      
Maximum exercisable period for options granted 5 years