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Summary of Performance option activity (Detail) - Performance Based Stock Options
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Incentive Stock Option Plans, Beginning balance | shares 120,782
Incentive Stock Option Plans, Option exercised | shares (3,035)
Incentive Stock Option Plans, Ending balance | shares 117,747
Weighted Average Price Per Share, Beginning balance $ 11.49
Weighted Average Price Per Share, Options exercised 11.49
Weighted Average Price Per Share, Ending balance 11.49
Exercisable Weighted Average Price Per Share, Beginning balance 11.49
Exercisable Weighted Average Price Per Share, Options exercised 11.49
Exercisable Weighted Average Price Per Share, Ending balance $ 11.49