Quarterly report pursuant to Section 13 or 15(d)

Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail)

v3.20.2
Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock unit awards that vested during the period 326,281  
Fair value of restricted shares that vested during the period $ 8,944 $ 7,630
Compensation expense recognized during the period 8,235 7,456
Income tax benefit recognized upon vesting of restricted stock awards $ 2,678 $ 1,473
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock unit awards that vested during the period 120,293 88,074
Fair value of restricted shares that vested during the period $ 3,669 $ 3,550
Accumulated dividends paid upon vesting of restricted stock unit awards 576 375
Compensation expense recognized during the period 4,624 3,030
Income tax benefit recognized upon vesting of restricted stock awards $ 215 $ 175