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Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 16,235 $ 7,262 $ 36,622 $ 14,230
Less: Preferred stock dividends (32) (63) (66) (244)
Less: Income attributable to participating securities, Income (Numerator) (763) (87) (1,274) (105)
Basic Earnings Per Share:        
Income allocated to common stockholders, Income (Numerator) 15,440 7,112 35,282 13,881
Income allocated to common stockholders, Shares (Denominator) 10,687 8,325 10,669 7,326
Income allocated to common stockholders, Per-Share Amount $ 1.44 $ 0.85 $ 3.31 $ 1.89
Diluted Earnings Per Share:        
Income available to common stockholders and assumed conversions, Income (Numerator) 15,472 7,175 35,348 14,125
Income available to common stockholders and assumed conversions, Shares (Denominator) 11,048 9,651 11,039 8,814
Income available to common stockholders and assumed conversions, Per-Share Amount $ 1.40 $ 0.74 $ 3.20 $ 1.60
Warrants [Member]
        
Effect of Dilutive Securities:        
Dilutive Securities, Shares (Denominator)   406   303
Stock Options [Member]
        
Effect of Dilutive Securities:        
Dilutive Securities, Shares (Denominator) 162 215 160 229
Convertible Preferred Stock [Member]
        
Effect of Dilutive Securities:        
Dilutive Securities, Income (Numerator) $ 32 $ 63 $ 66 $ 244
Dilutive Securities, Shares (Denominator) 199 705 210 956