Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per share
Net Income	$ 95,041	$ 57,518	$ 70,672
Less: earnings allocated to participating securities, Income	1,142	511	596
Net income available to common shareholders, Total	$ 93,899	$ 57,007	$ 70,076
Net income available to common shareholders, (in shares)	50,624	50,540	50,477
Less: earnings allocated to participating securities, (in shares)	0	0	0
Net income available to common shareholders, Total (in shares)	50,624	50,540	50,477
Net income available to common shareholders, (in usd per share)	$ 1.87	$ 1.14	$ 1.40
Less: earnings allocated to participating securities, (in usd per share)	0.02	0.01	0.01
Basic earnings (usd per share)	$ 1.85	$ 1.13	$ 1.39
Effect of dilutive securities
Stock options and restricted stock, Income	$ 0	$ 0	$ 0
Stock options and restricted stock, (in shares)	246	110	165
Stock options and restricted stock, (in usd per share)	$ 0	$ 0	$ (0.01)
Diluted earnings per share
Net income available to common shareholders plus assumed conversions, Income	$ 93,899	$ 57,007	$ 70,076
Net income available to common shareholders plus assumed conversions, (in shares)	50,870	50,650	50,642
Diluted earnings (usd per share)	$ 1.85	$ 1.13	$ 1.38