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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	114,658	114,658	114,658	114,658
Incentive Stock Option Plans, Options exercised	(32,850)			(32,850)
Incentive Stock Option Plans, Ending balance	81,808	114,658	114,658	81,808
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49
Weighted Average Price Per Share, Options exercised	11.49			11.49
Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49

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

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-Publisher FASB
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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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