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Stock-Based Compensation Plans - Summary of the Performance Awards (Details) - Performance Awards	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Awards
Unsettled, beginning balance (in shares) | shares	30,555
Granted (in shares) | shares	20,992
Forfeited (in shares) | shares	(6,444)
Unsettled, ending balance (in shares) | shares	45,103
Weighted Average Grant Date Fair Value
Nonvested (in dollars per share) | $ / shares	$ 65.83
Granted (in dollars per share) | $ / shares	103.29
Forfeited (in dollars per share) | $ / shares	80.62
Nonvested (in dollars per share) | $ / shares	$ 81.15

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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.

+ References

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-Paragraph 2
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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

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).

+ References

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- Definition

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.

+ References

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-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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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-Publisher FASB
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