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Summary of Option Activity (Detail) - Incentive Stock Options - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	108,423	117,249	123,087	307,696	316,987	332,823
Incentive Stock Option Plans, Option exercised	(387)	(8,826)	(5,838)	(86,446)	(9,291)	(15,836)
Incentive Stock Option Plans, Ending balance	108,036	108,423	117,249	221,250	307,696	316,987
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.48	$ 11.48	$ 9.16	$ 9.16	$ 9.14
Weighted Average Price Per Share, Option exercised	11.49	11.35	11.49	7.58	8.27	8.83
Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.48	$ 9.81	$ 9.16	$ 9.16

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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