Stock-Based Compensation Plans - Restricted Stock Granted (Details) - $ / shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted stock
Restricted stock shares
Outstanding at the beginning of the period (in shares)	161,714	157,066	131,724
Granted (in shares)	93,146	86,475	99,291
Vested (in shares)	(79,450)	(78,212)	(69,840)
Forfeited (in shares)	(2,119)	(3,615)	(4,109)
Outstanding at the ending of the period (in shares)	173,291	161,714	157,066
Weighted average grant date fair value per share
Outstanding at the beginning of the period (in dollars per share)	$ 210.97	$ 192.90	$ 203.28
Granted (in dollars per share)	177.70	231.93	178.84
Vested (in dollars per share)	207.93	197.51	192.32
Forfeited (in dollars per share)	194.78	218.19	195.77
Outstanding at the ending of the period (in dollars per share)	$ 194.68	$ 210.97	$ 192.90
Restricted stock converted from performance shares
Restricted stock shares
Outstanding at the beginning of the period (in shares)	26,370	74,627	146,319
Granted (in shares)	0	0	0
Vested (in shares)	(26,370)	(48,171)	(71,692)
Forfeited (in shares)	0	(86)	0
Outstanding at the ending of the period (in shares)	0	26,370	74,627

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

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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.

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- Definition

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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- 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).

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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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- Definition

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

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+ Details

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- Definition

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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