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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic [Abstract]                      
Net income $ 23,073 $ 17,940 $ 14,319 $ 15,130 $ 16,865 $ 13,479 $ 12,773 $ 10,549 $ 70,462 $ 53,666 $ 43,637
Less allocated income to participating securities                     142
Net income available to common shareholders - basic                 $ 70,462 $ 53,666 $ 43,495
Basic weighted-average common shares                 18,941,077 18,646,128 18,373,033
Basic earnings per share $ 1.21 $ 0.95 $ 0.76 $ 0.80 $ 0.90 $ 0.72 $ 0.69 $ 0.57 $ 3.72 $ 2.88 $ 2.37
Net income available to common shareholders - diluted $ 23,073 $ 17,940 $ 14,319 $ 15,130 $ 16,865 $ 13,479 $ 12,773 $ 10,549 $ 70,462 $ 53,666 $ 43,495
Weighted average common shares                 18,941,077 18,646,128 18,373,033
Stock options and performance shares                 178,109 282,376 375,776
Diluted weighted average common shares                 19,119,186 18,928,504 18,748,809
Diluted earnings per common share $ 1.21 $ 0.94 $ 0.75 $ 0.79 $ 0.89 $ 0.71 $ 0.68 $ 0.56 $ 3.69 $ 2.84 $ 2.32