Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator for EPS:
Net income	$ 21,941	$ 26,408	$ 19,882	$ 20,067	$ 48,349	$ 39,949
Less: Preferred stock dividends	(2)		(2)		(5)	(5)
Income available to common stockholders	$ 21,939		$ 19,880		$ 48,344	$ 39,944
Denominator for EPS:
Weighted average common shares outstanding (in shares)	31,240		32,102		31,224	32,347
Plus: Assumed conversion of share-based compensation (in shares)	45		43		43	68
Assumed conversion of preferred stock (in shares)	25		25		25	25
Weighted average diluted common shares outstanding (in shares)	31,310		32,170		31,292	32,440
Basic earnings per common share (in USD per share)	$ 0.70		$ 0.62		$ 1.55	$ 1.23
Diluted earnings per common share (in USD per share)	$ 0.70		$ 0.62		$ 1.54	$ 1.23