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Stock Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 05, 2012
Employee Stock Option [Member]        
Stock option details        
Shares available for future grants 10,102     800,000
Maximum exercisable period for options granted 10 years      
Black-Scholes-Merton option valuation model assumptions        
Expected Life (Years) 7 years 7 years    
Dividend yield (as a percent) 6.04% 2.93%    
Interest rate (as a percent) 0.74% 1.97%    
Volatility (as a percent) 29.04% 26.97%    
Number of options granted (in shares) 35,000      
Stock option activity        
Options outstanding at the beginning of the period (in shares) 658,588      
Plus: Options granted (in shares) 35,000      
Less:        
Exercise of stock options (in shares) 26,010      
Options forfeited (in shares) 16,451      
Options outstanding at the end of the period (in shares) 651,127 658,588    
Options fully vested and exercisable at the end of the period (in shares) 409,782      
Stock Options, Weighted average exercise price        
Options outstanding at the beginning, weighted average exercise price (in dollars per share) $ 27.55      
Plus: Options granted, weighted average exercise price (in dollars per share) 18.79      
Less:        
Options exercised, weighted average exercise price (in dollars per share) 20.87      
Options forfeited, weighted average exercise price (in dollars per share) 31.94      
Options outstanding at the end, weighted average exercise price (in dollars per share) 27.24 $ 27.55    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 22.98      
Stock Options, Weighted average remaining contractual term (years)        
Options outstanding at the end, weighted average remaining contractual term (years) 5 years 18 days      
Options fully vested and exercisable at the end, weighted average remaining contractual term (years) 3 years 7 months 9 days      
Stock Options, Aggregate intrinsic value        
Options outstanding at the end, aggregate intrinsic value $ 6,817,000      
Options fully vested and exercisable at the end, aggregate intrinsic value 5,953,000      
Stock-based compensation expense 743,000 $ 980,000 $ 1,035,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 1,254,000      
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition 1 year 8 months 12 days      
Other information pertaining to option activity        
Weighted average grant date fair value of stock options granted (in dollars per share) $ 2.46 $ 7.38 $ 11.78  
Total fair value of stock options vested $ 1,218,000 $ 1,333,000 $ 1,077,000  
Total intrinsic value of stock options exercised $ 356,000 $ 2,373,000 $ 2,045,000  
Incentive Stock Options to 10 Percent Shareholders [Member]        
Stock option details        
Maximum exercisable period for options granted 5 years