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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share, Basic [Abstract]        
Net income available to common shareholders-basic $ 17,940 $ 13,479 $ 47,389 $ 36,801
Basic weighted average common shares 18,968,718 18,676,033 18,911,675 18,603,227
Basic earnings per common share $ 0.95 $ 0.72 $ 2.51 $ 1.98
Net income available to common shareholders-diluted $ 17,940 $ 13,479 $ 47,389 $ 36,801
Weighted average common shares 18,968,718 18,676,033 18,911,675 18,603,227
Stock options and performance shares 127,541 253,744 176,465 302,653
Diluted weighted average common shares 19,096,259 18,929,777 19,088,140 18,905,880
Diluted earnings per common share $ 0.94 $ 0.71 $ 2.48 $ 1.95