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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Restricted Stock Awards  
Shares  
Beginning of year (in shares) | shares 141,551
Granted (in shares) | shares 17,900
Vested (in shares) | shares (18,600)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 140,851
Weighted Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 49.83
Granted (in dollars per share) | $ / shares 64.65
Vested (in dollars per share) | $ / shares 50.94
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 51.57
Stock Performance Awards  
Shares  
Beginning of year (in shares) | shares 189,800
Granted (in shares) | shares 59,400
Vested (in shares) | shares (55,000)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 194,200
Weighted Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 45.95
Granted (in dollars per share) | $ / shares 61.97
Vested (in dollars per share) | $ / shares 47.79
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 50.33