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Stock Options (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Apr. 05, 2012
Stock options under 2012 Plan
          
Stock option details          
Shares available for future grants 749,000   749,000   800,000
Maximum exercisable period for options granted     10 years    
Stock option activity          
Options outstanding at the beginning of the period (in shares)     794,877    
Plus: Options granted (in shares)     8,500    
Less:          
Options exercised (in shares)     11,738    
Options expired (in shares)     22,343    
Options forfeited (in shares)     20,600    
Options outstanding at the end of the period (in shares) 748,969   748,969    
Options fully vested and exercisable at the end of the period (in shares) 426,476   426,476    
Stock options, weighted average exercise price          
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 19.03    
Plus: Options granted, weighted average exercise price (in dollars per share)     $ 21.33    
Less:          
Options exercised, weighted average exercise price (in dollars per share)     $ 12.36    
Options expired, weighted average exercise price (in dollars per share)     $ 23.50    
Options forfeited, weighted average exercise price (in dollars per share)     $ 17.88    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.06   $ 19.06    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 22.74   $ 22.74    
Stock options, weighted average remaining contractual term          
Options outstanding at the end, weighted average remaining contractual term     3 years 2 months 5 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     1 year 4 months 2 days    
Stock options, aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 3,386,000   $ 3,386,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 991,000   991,000    
Stock-based compensation expense 101,000 113,000 322,000 366,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 900,000   $ 900,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     1 year 10 months 6 days    
Incentive stock options granted to 10% shareholders
          
Stock option details          
Maximum exercisable period for options granted     5 years