Employee Benefits - Summary of Equity-Based Awards for Employees (Details) - $ / shares	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Awards
Granted (in shares)	63,000	39,000
Common Stock Awards
Awards
Nonvested common stock awards, Beginning balance (in shares)	199,353
Granted (in shares)	108,219
Vested (in shares)	(146,834)
Forfeited/Cancelled (in shares)	(554)
Nonvested common stock awards, Ending balance (in shares)	160,184
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards, Beginning balance (in USD per share)	$ 68.99
Granted (in USD per share)	89.33
Vested (in USD per share)	74.72
Forfeited/Cancelled (in USD per share)	78.13
Nonvested performance-based stock awards, Ending balance (in USD per share)	$ 77.45
Performance-Based Stock Awards
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	143,401
Granted (in shares)	54,585
Forfeited/Cancelled (in shares)	0
Vested (in shares)	(71,933)
Nonvested performance-based stock awards/units, Ending balance (in shares)	126,053
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 81.30
Granted (in USD per share)	102.98
Vested (in USD per share)	59.07
Forfeited/Cancelled (in USD per share)	0
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 103.37
Performance-Based Restricted Stock Units
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	8,252
Granted (in shares)	16,618
Forfeited/Cancelled (in shares)	(239)
Vested (in shares)	(8,061)
Nonvested performance-based stock awards/units, Ending balance (in shares)	16,570
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 126.89
Granted (in USD per share)	80.55
Vested (in USD per share)	126.89
Forfeited/Cancelled (in USD per share)	117.58
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 80.55

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

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
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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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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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