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Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$ 10.34-15.23  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 148,474
Average remaining contractual life 2 years 2 months 12 days
Options Outstanding, weighted average exercise price (in dollars per share) $ 14.88
Number of options exercisable (in shares) | shares 148,474
Options exercisable, weighted average exercise price (in dollars per share) $ 14.88
$ 10.34-15.23 | 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) 14.50
$ 10.34-15.23 | 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) $ 15.23
$ 16.38-26.31  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 350,726
Average remaining contractual life 6 years 2 months 12 days
Options Outstanding, weighted average exercise price (in dollars per share) $ 20.89
Number of options exercisable (in shares) | shares 204,905
Options exercisable, weighted average exercise price (in dollars per share) $ 18.28
$ 16.38-26.31 | 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) 16.38
$ 16.38-26.31 | 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