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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Assumptions Used To Determine Fair Value of Stock Options The following assumptions were used to determine the fair value of stock options as of the grant date to determine compensation expense for the years ended December 31, 2020, 2019, and 2018:
Stock Options:202020192018
Grant date fair value$6.55 $5.34 $7.69 
Expected life of options8 years8 years8 years
Risk-free interest rate0.79 %1.74 %3.01 %
Dividend yield rate4.55 %4.11 %2.91 %
Price volatility35.44 %24.34 %23.47 %
Stock Options Activity The following table summarizes stock option activity during 2020: 
  Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Life, in Years
 
 
Outstanding at January 1, 2020158,620 $30.45  
Granted20,173 32.09  
Forfeited— —  
Exercised— —  
Outstanding at December 31, 2020178,793 $30.64 6.29
Restricted Stock Unit Activity The following table summarizes restricted stock unit activity during 2020:
  Number of SharesWeighted Average Grant Date Fair ValueWeighted Average Remaining Contractual Life, in Years
 
 
Outstanding at January 1, 202071,952 $34.16  
Granted22,709 32.09  
Dividend equivalents awarded3,688 27.65 
Vested(25,532)29.75  
Forfeited— —  
Outstanding at December 31, 202072,817 $33.33 2.21