Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details)	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Restricted Stock Awards
Shares
Beginning of year (in shares) | shares	138,093
Granted (in shares) | shares	15,842
Vested (in shares) | shares	(18,969)
Forfeited (in shares) | shares	0
End of year (in shares) | shares	134,966
Weighted Average Grant-Date Fair Value
Beginning of year (in dollars per share) | $ / shares	$ 44.48
Granted (in dollars per share) | $ / shares	61.39
Vested (in dollars per share) | $ / shares	46.49
Forfeited (in dollars per share) | $ / shares	0
End of year (in dollars per share) | $ / shares	$ 46.18
Stock Performance Awards
Shares
Beginning of year (in shares) | shares	189,600
Granted (in shares) | shares	55,800
Vested (in shares) | shares	(55,600)
Forfeited (in shares) | shares	0
End of year (in shares) | shares	189,800
Weighted Average Grant-Date Fair Value
Beginning of year (in dollars per share) | $ / shares	$ 42.54
Granted (in dollars per share) | $ / shares	54.91
Vested (in dollars per share) | $ / shares	43.30
Forfeited (in dollars per share) | $ / shares	0
End of year (in dollars per share) | $ / shares	$ 45.95