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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	114,658	114,658	120,782
Incentive Stock Option Plans, Option exercised	(32,850)		(6,124)
Incentive Stock Option Plans, Ending balance	81,808	114,658	114,658
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49
Weighted Average Price Per Share, Option exercised	11.49		11.49
Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

+ References

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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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