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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Stock Awards  
Shares  
Beginning of year (in shares) | shares 128,664
Granted (in shares) | shares 21,600
Vested (in shares) | shares (16,800)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 133,464
Weighted Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 44.30
Granted (in dollars per share) | $ / shares 42.35
Vested (in dollars per share) | $ / shares 45.93
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 43.78
Stock Performance Awards  
Shares  
Beginning of year (in shares) | shares 164,600
Granted (in shares) | shares 79,000
Vested (in shares) | shares (54,000)
Forfeited (in shares) | shares 0
End of year (in shares) | shares 189,600
Weighted Average Grant-Date Fair Value  
Beginning of year (in dollars per share) | $ / shares $ 42.32
Granted (in dollars per share) | $ / shares 38.34
Vested (in dollars per share) | $ / shares 35.73
Forfeited (in dollars per share) | $ / shares 0
End of year (in dollars per share) | $ / shares $ 42.54