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Accounting Policies - Summary of Computation of Basic and 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
Basic earnings per share        
Net income $ 6,326 $ 4,728 $ 11,707 $ 10,086
Less: Preferred stock dividends   31 42 63
Net income available to common shareholders $ 6,326 $ 4,697 $ 11,665 $ 10,023
Weighted average common shares outstanding 12,179,253 9,240,005 12,064,335 9,228,075
Basic Earnings Per Share $ 0.52 $ 0.51 $ 0.97 $ 1.09
Diluted earnings per share        
Net income available to common shareholders $ 6,326 $ 4,697 $ 11,665 $ 10,023
Weighted average common shares outstanding 12,179,253 9,240,005 12,064,335 9,228,075
Effect of dilutive securities:        
Warrants   324,698   323,198
Weighted average shares outstanding 12,242,778 9,637,586 12,127,028 9,615,551
Diluted Earnings Per Share $ 0.52 $ 0.49 $ 0.96 $ 1.04
Restricted Stock [Member]        
Effect of dilutive securities:        
Effect of dilutive securities 20,721 34,892 21,050 30,816
Stock Options [Member]        
Effect of dilutive securities:        
Effect of dilutive securities 42,804 37,991 41,643 33,462