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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021, 2020, and 2019:
Stock Options:202120202019
Grant date fair value$10.27 $6.55 $5.34 
Expected life of options8 years8 years8 years
Risk-free interest rate1.33 %0.79 %1.74 %
Dividend yield rate3.86 %4.55 %4.11 %
Price volatility36.46 %35.44 %24.34 %
Stock Options Activity The following table summarizes stock option activity during 2021: 
  Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Life, in Years
 
 
Outstanding at January 1, 2021178,793 $30.64  
Granted12,893 42.02  
Forfeited— —  
Exercised(54,867)26.10  
Outstanding at December 31, 2021136,819 $33.53 6.61
Restricted Stock Unit Activity The following table summarizes restricted stock unit activity during 2021:
  Number of SharesWeighted Average Grant Date Fair ValueWeighted Average Remaining Contractual Life, in Years
 
 
Outstanding at January 1, 202172,817 $33.33  
Granted17,316 42.02  
Dividend equivalents awarded2,310 37.07 
Vested(33,490)33.24  
Forfeited(2,738)32.50  
Outstanding at December 31, 202156,215 $34.74 2.29