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Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator for Earnings per Share-Basic:        
Net income $ 18,188 $ 14,720 $ 31,023 $ 28,753
Less: Income allocated to participating shares 79 29 123 64
Net Income Allocated to Shareholders 18,109 14,691 30,900 28,689
Numerator for Earnings per Share-Diluted:        
Net income 18,188 14,720 31,023 28,753
Net Income Available to Shareholders $ 18,188 $ 14,720 $ 31,023 $ 28,753
Denominators:        
Weighted Average Shares Outstanding-Basic 34,652,895 29,684,300 32,951,936 29,672,611
Add: Potentially dilutive shares 28,283 16,894 36,359 27,559
Denominator for Treasury Stock Method-Diluted 34,681,178 29,701,194 32,988,295 29,700,170
Weighted Average Shares Outstanding-Basic 34,652,895 29,684,300 32,951,936 29,672,611
Add: Average participating shares outstanding 151,134 58,973 131,563 66,563
Denominator for Two-Class Method-Diluted 34,804,029 29,743,273 33,083,499 29,739,174
Earnings per share—basic (in dollars per share) $ 0.52 $ 0.49 $ 0.94 $ 0.97
Earnings per share—diluted (in dollars per share) 0.52 $ 0.49 0.94 $ 0.97
Anti-dilutive warrants - exercise price (in USD per share) $ 31.53   $ 31.53  
Warrants [Member]        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 517,012 517,012 517,012 517,012
Stock Options [Member]        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 155,500 428,493 155,500 428,676
Restricted Stock [Member]        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 122,851 42,079 95,204 39,005