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Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basic earnings per share        
Net income $ 4,958 $ 4,785 $ 13,153 $ 15,761
Less: Preferred stock dividends and accretion of discount 40 66 102 308
Net income available to common shareholders 4,918 4,719 13,051 15,453
Weighted average common shares outstanding 9,208,707 8,618,969 9,009,663 8,617,972
Basic Earnings Per Share $ 0.53 $ 0.55 $ 1.45 $ 1.79
Diluted earnings per share        
Net income available to common shareholders $ 4,918 $ 4,719 $ 13,051 $ 15,453
Weighted average common shares outstanding 9,208,707 8,618,969 9,009,663 8,617,972
Effect of dilutive securities:        
Warrants 309,790 314,353 308,647 299,704
Weighted average shares outstanding 9,588,332 9,019,211 9,389,359 8,998,628
Diluted Earnings Per Share $ 0.51 $ 0.52 $ 1.39 $ 1.72
Restricted Stock [Member]
        
Effect of dilutive securities:        
Effect of dilutive securities 36,387 40,833 37,127 39,883
Stock Options [Member]
        
Effect of dilutive securities:        
Effect of dilutive securities 33,448 45,056 33,922 41,069