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Stock Options (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Apr. 05, 2012
Stock options under 2012 Plan          
Stock option details          
Shares available for future grants 168,500   168,500   800,000
Maximum exercisable period for options granted     10 years    
Stock option activity          
Options outstanding at the beginning of the period (in shares)     993,889    
Plus: Options granted (in shares)     56,500    
Less:          
Options exercised (in shares)     72,611    
Options expired (in shares)     44,075    
Options forfeited (in shares)     37,221    
Options outstanding at the end of the period (in shares) 896,482   896,482    
Options fully vested and exercisable at the end of the period (in shares) 184,965   184,965    
Stock options, weighted average exercise price          
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 18.94    
Plus: Options granted, weighted average exercise price (in dollars per share)     24.24    
Less:          
Options exercised, weighted average exercise price (in dollars per share)     17.73    
Options expired, weighted average exercise price (in dollars per share)     26.73    
Options forfeited, weighted average exercise price (in dollars per share)     17.85    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.00   19.00    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 13.59   $ 13.59    
Stock options, weighted average remaining contractual term          
Options outstanding at the end, weighted average remaining contractual term     6 years 10 months 10 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     3 years 4 months 6 days    
Stock options, aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 5,411,000   $ 5,411,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 2,115,000   2,115,000    
Stock-based compensation expense 289,000 $ 301,000 872,000 $ 766,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 3,263,000   $ 3,263,000    
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