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Share-Based Payments - Summary of Restricted Stock Awards and Stock Performance Awards (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Awards
Shares
Beginning of year (in shares)	128,664
Granted (in shares)	59,150
Vested (in shares)	(47,646)
Forfeited (in shares)	(2,075)
End of year (in shares)	138,093	128,664
Weighted Average Grant-Date Fair Value
Beginning of year (in dollars per share)	$ 44.30
Granted (in dollars per share)	43.55	$ 45.97	$ 48.18
Vested (in dollars per share)	42.98
Forfeited (in dollars per share)	40.95
End of year (in dollars per share)	$ 44.48	$ 44.30
Stock Performance Awards
Shares
Beginning of year (in shares)	164,600
Granted (in shares)	79,000
Vested (in shares)	(54,000)
Forfeited (in shares)	0
End of year (in shares)	189,600	164,600
Weighted Average Grant-Date Fair Value
Beginning of year (in dollars per share)	$ 42.32
Granted (in dollars per share)	38.34	$ 47.79	$ 42.87
Vested (in dollars per share)	35.73
Forfeited (in dollars per share)	0
End of year (in dollars per share)	$ 42.54	$ 42.32

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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