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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic earnings per share        
Net income $ 4,785 $ 4,850 $ 15,761 $ 14,373
Less: Preferred stock dividends and accretion of discount 66 63 308 325
Net Income Available to Common Shareholders 4,719 4,787 15,453 14,048
Weighted average common shares outstanding 8,618,969 8,503,475 8,617,972 7,758,537
Basic Earnings Per Share $ 0.55 $ 0.56 $ 1.79 $ 1.81
Diluted earnings per share        
Net income available to common shareholders $ 4,719 $ 4,787 $ 15,453 $ 14,048
Weighted average common shares outstanding 8,618,969 8,503,475 8,617,972 7,758,537
Effect of dilutive securities:        
Warrants 314,353 269,431 299,704 231,037
Weighted average shares outstanding 9,019,211 8,838,659 8,998,628 8,034,996
Diluted Earnings Per Share $ 0.52 $ 0.54 $ 1.72 $ 1.75
Restricted Stock [Member]
        
Effect of dilutive securities:        
Effect of dilutive securities 40,833 30,971 39,883 19,317
Stock Options [Member]
        
Effect of dilutive securities:        
Effect of dilutive securities 45,056 34,782 41,069 26,105