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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator for EPS:            
Net income $ 37,293 $ 40,148 $ 46,084 $ 40,055 $ 77,441 $ 86,139
Less: Preferred stock dividends (2)   (2)   (5) (5)
Income available to common stockholders $ 37,291   $ 46,082   $ 77,436 $ 86,134
Denominator for EPS:            
Weighted average common shares outstanding (in shares) 34,311   34,909   34,525 34,874
Plus: Assumed conversion of share-based compensation 276   655   353 737
Assumed conversion of preferred stock 25   25   25 25
Weighted average diluted common shares outstanding (in shares) 34,612   35,589   34,903 35,636
Basic earnings per common share (in dollars per share) $ 1.09   $ 1.32   $ 2.24 $ 2.47
Diluted earnings per common share (in dollars per share) $ 1.08   $ 1.29   $ 2.22 $ 2.42