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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic earnings per share        
Net income $ 4,728 $ 4,778 $ 10,086 $ 8,195
Less: Preferred stock dividends 31 32 63 63
Net income available to common shareholders $ 4,697 $ 4,746 $ 10,023 $ 8,132
Weighted average common shares outstanding 9,240,005 9,182,986 9,228,075 8,908,492
Basic Earnings Per Share $ 0.51 $ 0.52 $ 1.09 $ 0.91
Diluted earnings per share        
Net income available to common shareholders $ 4,697 $ 4,746 $ 10,023 $ 8,132
Weighted average common shares outstanding 9,240,005 9,182,986 9,228,075 8,908,492
Effect of dilutive securities:        
Warrants 324,698 303,399 323,198 308,060
Weighted average shares outstanding 9,637,586 9,560,939 9,615,551 9,293,423
Diluted Earnings Per Share $ 0.49 $ 0.50 $ 1.04 $ 0.88
Restricted Stock [Member]        
Effect of dilutive securities:        
Effect of dilutive securities 34,892 38,003 30,816 38,717
Stock Options [Member]        
Effect of dilutive securities:        
Effect of dilutive securities 37,991 36,551 33,462 38,154