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Stock Options (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Apr. 05, 2012
Stock options under 2012 Plan      
Stock option details      
Shares available for future grants 206,100   800,000
Maximum exercisable period for options granted 10 years    
Stock option activity      
Options outstanding at the beginning of the period (in shares) 800,502    
Less:      
Options exercised (in shares) 59,751    
Options forfeited (in shares) 9,213    
Options outstanding at the end of the period (in shares) 731,538    
Options fully vested and exercisable at the end of the period (in shares) 261,936    
Stock Options, Weighted Average Exercise Price      
Options outstanding at the beginning, weighted average exercise price (in dollars per share) $ 19.43    
Less:      
Options exercised, weighted average exercise price (in dollars per share) 12.40    
Options forfeited, weighted average exercise price (in dollars per share) 19.28    
Options outstanding at the end, weighted average exercise price (in dollars per share) 20.00    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 18.73    
Stock Options, Weighted Average Remaining Contractual Term      
Options outstanding at the end, weighted average remaining contractual term 6 years 11 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term 5 years 2 months 27 days    
Stock Options, Aggregate Intrinsic Value      
Options outstanding at the end, aggregate intrinsic value $ 11,263,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 4,367,000    
Stock-based compensation expense 268,000 $ 285,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 2,054,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition 1 year 7 months 6 days    
Incentive stock options granted to 10% shareholders      
Stock option details      
Maximum exercisable period for options granted 5 years