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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)
 6 Months Ended
Jun. 30, 2023
$ / shares
shares
Restricted Stock Awards  
Shares  
Beginning of year (in shares) | shares 141,551
Granted (in shares) | shares 55,205
Vested (in shares) | shares (45,493)
Forfeited (in shares) | shares (1,300)
End of year (in shares) | shares 149,963
Weighted-Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 49.83
Granted (in dollars per share) | $ / shares 68.03
Vested (in dollars per share) | $ / shares 50.02
Forfeited (in dollars per share) | $ / shares 50.00
End of year (in dollars per share) | $ / shares $ 56.47
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