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Accounting for Stock Based Compensation - Summarizes Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning of period, Shares	34,906	34,920	136,566
Granted, Shares	13,742	32,406	19,920
Vested, Shares	(37,272)	(32,420)	(91,566)
Forfeited, Shares			(30,000)
Outstanding at end of period, Shares	11,376	34,906	34,920
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 39.82	$ 38.31	$ 37.16
Granted, Weighted-Average Grant Date Fair Value	70.18	39.96	40.16
Vested, Weighted-Average Grant Date Fair Value	41.70	38.33	37.09
Forfeited, Weighted-Average Grant Date Fair Value			38.05
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 70.33	$ 39.82	$ 38.31

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

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-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 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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