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Stock Options (Details) (2012 Plan Stock Options, USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 21, 2012
Stock option details        
Shares available for future grants 757,500     800,000
Maximum exercisable period for options granted 10 years      
Black-Scholes-Merton option valuation model assumptions        
Expected Life 7 years 7 months 17 days 6 years 1 month 17 days    
Dividend yield (as a percent) 2.33% 2.58%    
Interest rate (as a percent) 1.58% 1.39%    
Volatility (as a percent) 47.30% 49.21%    
Stock option activity        
Options outstanding at the beginning of the period (in shares) 844,721      
Plus: Options granted (in shares) 42,500      
Less:        
Options exercised (in shares) 4,865      
Options forfeited (in shares) 87,479      
Options outstanding at the end of the period (in shares) 794,877 844,721    
Options fully vested and exercisable at the end of the period (in shares) 403,546      
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) $ 17.14      
Less:        
Options exercised, weighted average exercise price (in dollars per share) $ 10.49      
Options forfeited, weighted average exercise price (in dollars per share) $ 19.08      
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.03 $ 19.08    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 23.60      
Stock options, weighted average remaining contractual term        
Options outstanding at the end, weighted average remaining contractual term 3 years 9 months 7 days      
Options fully vested and exercisable at the end, weighted average remaining contractual term 1 year 9 months 11 days      
Stock options, aggregate intrinsic value        
Options outstanding at the end, aggregate intrinsic value $ 2,093,000      
Options fully vested and exercisable at the end, aggregate intrinsic value 445,000      
Stock-based compensation expense 474,000 387,000 534,000  
Stock-based compensation cost, unrecognized, related to non-vested options 1,157,000      
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition 1 year 11 months 19 days      
Other information pertaining to option activity        
Weighted average grant date fair value of stock options granted (in dollars per share) $ 8.71 $ 5.51    
Total fair value of stock options vested 524,000 661,000 551,000  
Total intrinsic value of stock options exercised $ 41,000 $ 27,000 $ 2,000  
Non-vested Options        
Granted (in shares) 42,500      
Weighted average grant-date fair value, non-vested options        
Granted (in dollars per share) $ 8.71 $ 5.51    
Incentive stock options granted to 10% shareholders
        
Stock option details        
Maximum exercisable period for options granted 5 years