XML 126 R109.htm IDEA: XBRL DOCUMENT v3.20.4
Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
$14.50-15.23  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 138,475
Average remaining contractual life 1 year 1 month 6 days
Options Outstanding, weighted average exercise price (in dollars per share) $ 14.89
Number of options exercisable (in shares) | shares 138,475
Options exercisable, weighted average exercise price (in dollars per share) $ 14.89
$14.50-15.23 | 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
$14.50-15.23 | 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
$16.38-27.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 457,966
Average remaining contractual life 6 years 1 month 6 days
Options Outstanding, weighted average exercise price (in dollars per share) $ 20.83
Number of options exercisable (in shares) | shares 279,901
Options exercisable, weighted average exercise price (in dollars per share) $ 19.50
$16.38-27.25 | 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) 16.38
$16.38-27.25 | 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