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Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
$15.23-18.70  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 274,942
Average remaining contractual life 2 years 8 months 12 days
Options Outstanding, weighted average exercise price (in dollars per share) $ 17.28
Number of options exercisable (in shares) | shares 274,942
Options exercisable, weighted average exercise price (in dollars per share) $ 17.28
$15.23-18.70 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercisable, weighted average exercise price (in dollars per share) 15.23
$15.23-18.70 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercisable, weighted average exercise price (in dollars per share) $ 18.7
$20.62-27.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 291,511
Average remaining contractual life 7 years 6 months
Options Outstanding, weighted average exercise price (in dollars per share) $ 23.15
Number of options exercisable (in shares) | shares 149,518
Options exercisable, weighted average exercise price (in dollars per share) $ 24.91
$20.62-27.25 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercisable, weighted average exercise price (in dollars per share) 20.62
$20.62-27.25 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercisable, weighted average exercise price (in dollars per share) $ 27.25