Quarterly report pursuant to Section 13 or 15(d)

Summary of Restricted Stock Award Activity (Detail)

v3.19.3
Summary of Restricted Stock Award Activity (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock unit awards that vested during the period 198,711  
Fair value of restricted shares that vested during the period $ 7,630 $ 7,815
Compensation expense recognized during the period 7,456 7,266
Income tax benefit recognized upon vesting of restricted stock awards $ 1,473 $ 1,751
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 88,074 127,084
Fair value of restricted shares that vested during the period $ 3,550 $ 4,846
Accumulated dividends paid upon vesting of restricted stock unit awards 375 526
Compensation expense recognized during the period 3,030 3,098
Income tax benefit recognized upon vesting of restricted stock awards $ 175 $ 740