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Stock-Based Compensation Plans - Restricted Stock Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted stock shares
Granted (in shares)		0	0
Restricted stock
Restricted stock shares
Outstanding at the beginning of the period (in shares)	131,724	148,326	160,411
Granted (in shares)	99,291	69,228	79,430
Vested (in shares)	(69,840)	(79,931)	(89,289)
Forfeited (in shares)	(4,109)	(5,899)	(2,226)
Outstanding at the ending of the period (in shares)	157,066	131,724	148,326
Restricted stock shares weighted average grant date fair value per share
Outstanding at the beginning of the period (in dollars per share)	$ 203.28	$ 181.29	$ 166.33
Granted (in dollars per share)	178.84	221.08	196.43
Vested (in dollars per share)	192.32	178.41	168.06
Forfeited (in dollars per share)	195.77	196.22	174.45
Outstanding at the ending of the period (in dollars per share)	$ 192.90	$ 203.28	$ 181.29
Restricted stock converted from performance shares
Restricted stock shares
Outstanding at the beginning of the period (in shares)	146,319	163,111	209,238
Granted (in shares)	0	96,317	73,072
Vested (in shares)	(71,692)	(111,325)	(119,064)
Forfeited (in shares)	0	(1,784)	(135)
Outstanding at the ending of the period (in shares)	74,627	146,319	163,111

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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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 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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