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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Restricted Stock Awards  
Shares  
Beginning of year (in shares) | shares 143,417
Granted (in shares) | shares 16,700
Vested (in shares) | shares (16,833)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 143,284
Weighted-Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 68.47
Granted (in dollars per share) | $ / shares 79.24
Vested (in dollars per share) | $ / shares 63.40
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 70.32
Stock Performance Awards  
Shares  
Beginning of year (in shares) | shares 144,800
Granted (in shares) | shares 57,000
Vested (in shares) | shares (49,000)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 152,800
Weighted-Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 68.85
Granted (in dollars per share) | $ / shares 73.90
Vested (in dollars per share) | $ / shares 53.93
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 75.52