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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator for Earnings per Share-Basic:        
Net income $ 17,059 $ 18,188 $ 33,152 $ 31,023
Less: Income allocated to participating shares 60 79 101 123
Net Income Allocated to Shareholders 16,999 18,109 33,051 30,900
Numerator for Earnings per Share-Diluted:        
Net income 17,059 18,188 33,152 31,023
Net Income Available to Shareholders $ 17,059 $ 18,188 $ 33,152 $ 31,023
Denominators:        
Weighted Average Shares Outstanding-Basic 34,674,712 34,652,895 34,666,773 32,951,936
Add: Potentially dilutive shares 89,853 28,283 80,890 36,359
Denominator for Treasury Stock Method-Diluted (in shares) 34,764,565 34,681,178 34,747,663 32,988,295
Weighted Average Shares Outstanding-Basic 34,674,712 34,652,895 34,666,773 32,951,936
Add: Average participating shares outstanding 122,160 151,134 105,794 131,563
Denominator for Two-Class Method-Diluted (in shares) 34,796,872 34,804,029 34,772,567 33,083,499
Earnings per share—basic (in dollars per share) $ 0.49 $ 0.52 $ 0.96 $ 0.94
Earnings per share—diluted (in dollars per share) 0.49 0.52 0.95 0.94
Anti-dilutive warrants - exercise price (in dollars per share) $ 31.53 $ 31,530.00 $ 31.53 $ 31,530.00
Warrants        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 517,012 517,012 517,012 517,012
Stock Options        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 0 155,500 0 155,500
Restricted Stock        
Denominators:        
Anti-dilutive excluded from potentially dilutive shares 144,998 122,851 117,796 95,204