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Stock Options (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 05, 2012
Stock options under 2012 Plan          
Stock option details          
Shares available for future grants 190,250   190,250   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)     14,900    
Options forfeited (in shares)     18,000    
Options outstanding at the end of the period (in shares) 842,827   842,827    
Options fully vested and exercisable at the end of the period (in shares) 246,708   246,708    
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)     11.29    
Options forfeited, weighted average exercise price (in dollars per share)     21.07    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.19   19.19    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 15.63   $ 15.63    
Stock Options, Weighted Average Remaining Contractual Term          
Options outstanding at the end, weighted average remaining contractual term     6 years 2 months 27 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     3 years 11 months 1 day    
Stock Options, Aggregate Intrinsic Value          
Options outstanding at the end, aggregate intrinsic value $ 5,814,000   $ 5,814,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 2,581,000   2,581,000    
Stock-based compensation expense 269,000 $ 291,000 554,000 $ 583,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 2,809,000   $ 2,809,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     1 year 10 months 24 days    
Incentive stock options granted to 10% shareholders          
Stock option details          
Maximum exercisable period for options granted     5 years