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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)
 9 Months Ended
Sep. 30, 2024
$ / shares
shares
Restricted Stock Awards  
Shares  
Beginning of year (in shares) | shares 148,913
Granted (in shares) | shares 49,425
Vested (in shares) | shares (57,771)
Forfeited (in shares) | shares (150)
End of year (in shares) | shares 140,417
Weighted-Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 56.48
Granted (in dollars per share) | $ / shares 85.77
Vested (in dollars per share) | $ / shares 52.78
Forfeited (in dollars per share) | $ / shares 66.39
End of year (in dollars per share) | $ / shares $ 68.30
Stock Performance Awards  
Shares  
Beginning of year (in shares) | shares 194,200
Granted (in shares) | shares 43,400
Vested (in shares) | shares (92,800)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 144,800
Weighted-Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 50.33
Granted (in dollars per share) | $ / shares 94.45
Vested (in dollars per share) | $ / shares 42.06
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 68.85