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EARNINGS PER COMMON SHARE - Computations for Basic and Diluted Earnings/(Loss) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic:    
Net income $ 19,687 $ 12,574
Less: income allocated to participating securities (360) (272)
Less: participating securities dividends (186) (173)
Less: preferred stock dividends (4,575) (910)
Net income allocated to common stockholders $ 14,566 $ 11,219
Weighted average common shares outstanding (in shares) 39,996,752 37,873,253
Basic earnings per common share (in usd per share) $ 0.36 $ 0.30
Diluted:    
Net income allocated to common stockholders $ 14,566 $ 11,219
Additional income allocation for class B dilutive shares 0 0
Adjusted net income allocated to common stockholders $ 14,566 $ 11,219
Add: Dilutive effects of purchase contracts 0 0
Add: Dilutive effects of warrants 479,025 283,911
Average shares and dilutive common shares (in shares) 40,751,616 38,304,666
Diluted earnings per common share (in usd per share) $ 0.36 $ 0.29
Restricted Stock Units (RSUs)    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 138,644 146,876
Stock Option    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 137,195 626
Class A Common Stock    
Basic:    
Net income $ 19,662 $ 12,560
Less: income allocated to participating securities (360) (272)
Less: participating securities dividends (186) (173)
Less: preferred stock dividends (4,569) (909)
Net income allocated to common stockholders $ 14,547 $ 11,206
Weighted average common shares outstanding (in shares) 39,946,412 37,831,035
Basic earnings per common share (in usd per share) $ 0.36 $ 0.30
Diluted:    
Net income allocated to common stockholders $ 14,547 $ 11,206
Additional income allocation for class B dilutive shares (172) (85)
Adjusted net income allocated to common stockholders $ 14,375 $ 11,121
Add: Dilutive effects of purchase contracts 0 0
Add: Dilutive effects of warrants 0 0
Average shares and dilutive common shares (in shares) 40,222,251 37,978,537
Diluted earnings per common share (in usd per share) $ 0.36 $ 0.29
Class A Common Stock | Restricted Stock Units (RSUs)    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 138,644 146,876
Class A Common Stock | Stock Option    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 137,195 626
Class B Common Stock    
Basic:    
Net income $ 25 $ 14
Less: income allocated to participating securities 0 0
Less: participating securities dividends 0 0
Less: preferred stock dividends (6) (1)
Net income allocated to common stockholders $ 19 $ 13
Weighted average common shares outstanding (in shares) 50,340 42,218
Basic earnings per common share (in usd per share) $ 0.36 $ 0.30
Diluted:    
Net income allocated to common stockholders $ 19 $ 13
Additional income allocation for class B dilutive shares 172 85
Adjusted net income allocated to common stockholders $ 191 $ 98
Add: Dilutive effects of purchase contracts 0 0
Add: Dilutive effects of warrants 479,025 283,911
Average shares and dilutive common shares (in shares) 529,365 326,129
Diluted earnings per common share (in usd per share) $ 0.36 $ 0.30
Class B Common Stock | Restricted Stock Units (RSUs)    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 0 0
Class B Common Stock | Stock Option    
Diluted:    
Add: Dilutive effects of restricted stock units and stock options 0 0