XML 136 R103.htm IDEA: XBRL DOCUMENT v3.24.0.1
Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Awards      
Shares      
Beginning of year (in shares) 141,551    
Granted (in shares) 55,205    
Vested (in shares) (45,493)    
Forfeited (in shares) (2,350)    
End of year (in shares) 148,913 141,551  
Weighted-Average Grant-Date Fair Value      
Beginning of year (in dollars per share) $ 49.83    
Granted (in dollars per share) 68.03 $ 59.95 $ 43.55
Vested (in dollars per share) 50.02    
Forfeited (in dollars per share) 52.02    
End of year (in dollars per share) $ 56.48 $ 49.83  
Stock Performance Awards      
Shares      
Beginning of year (in shares) 189,800    
Granted (in shares) 59,400    
Vested (in shares) (55,000)    
Forfeited (in shares) 0    
End of year (in shares) 194,200 189,800  
Weighted-Average Grant-Date Fair Value      
Beginning of year (in dollars per share) $ 45.95    
Granted (in dollars per share) 61.97 $ 54.91 $ 38.34
Vested (in dollars per share) 47.79    
Forfeited (in dollars per share) 0    
End of year (in dollars per share) $ 50.33 $ 45.95