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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic:                      
Net income (loss) $ 19,038 $ 14,536 $ 15,924 $ 12,574 $ 10,110 $ 11,247 $ 8,099 $ 749 $ 62,072 $ 30,205 $ (84)
Less: income allocated to participating securities                 (1,310) (498) 0
Less: participating securities dividends                 (713) (543) 0
Less: preferred stock dividends $ (3,030) $ (3,040) $ (2,843) $ (910) $ (910) $ (910) $ (910) $ (910) (9,823) (3,640) (2,185)
Net income (loss) allocated to common stockholders                 $ 50,226 $ 25,524 $ (2,269)
Weighted average common shares outstanding (in shares)                 37,046,594 28,044,441 15,286,834
Basic earnings per common share (in usd per share)                 $ 1.36 $ 0.91 $ (0.15)
Diluted:                      
Net income allocated to common shareholders                 $ 50,226 $ 25,524 $ (2,269)
Additional income allocation for class B dilutive shares                 0 0 0
Adjusted net income (loss) allocated to common stockholders                 $ 50,226 $ 25,524 $ (2,269)
Add: Dilutive effects of purchase contracts                 0 26,807 0
Add: Dilutive effects of warrants                 383,255 115,997 0
Average shares and dilutive common shares (in shares)                 37,598,509 28,248,223 15,286,834
Diluted earnings per common share (in usd per share)                 $ 1.34 $ 0.90 $ (0.15)
Class A Common Stock                      
Basic:                      
Net income (loss)                 $ 62,050 $ 29,559 $ (80)
Less: income allocated to participating securities                 (1,310) (487) 0
Less: participating securities dividends                 (713) (531) 0
Less: preferred stock dividends                 (9,820) (3,562) (2,070)
Net income (loss) allocated to common stockholders                 $ 50,207 $ 24,979 $ (2,150)
Weighted average common shares outstanding (in shares)                 37,033,725 27,444,878 14,481,060
Basic earnings per common share (in usd per share) $ 0.40 $ 0.29 $ 0.33 $ 0.30 $ 0.25 $ 0.31 $ 0.27 $ (0.01) $ 1.36 $ 0.91 $ (0.15)
Diluted:                      
Net income allocated to common shareholders                 $ 50,207 $ 24,979 $ (2,150)
Additional income allocation for class B dilutive shares                 (520) (106) 0
Adjusted net income (loss) allocated to common stockholders                 $ 49,687 $ 24,873 $ (2,150)
Add: Dilutive effects of purchase contracts                 0 26,807 0
Add: Dilutive effects of warrants                 0 0 0
Average shares and dilutive common shares (in shares)                 37,202,385 27,532,663 14,481,060
Diluted earnings per common share (in usd per share) 0.39 0.29 0.32 0.29 0.25 0.31 0.27 (0.01) $ 1.34 $ 0.90 $ (0.15)
Class B Common Stock                      
Basic:                      
Net income (loss)                 $ 22 $ 646 $ (4)
Less: income allocated to participating securities                 0 (11) 0
Less: participating securities dividends                 0 (12) 0
Less: preferred stock dividends                 (3) (78) (115)
Net income (loss) allocated to common stockholders                 $ 19 $ 545 $ (119)
Weighted average common shares outstanding (in shares)                 12,869 599,563 805,774
Basic earnings per common share (in usd per share) 0.40 0.29 0.33 0.30 0.25 0.31 0.27 (0.01) $ 1.36 $ 0.91 $ (0.15)
Diluted:                      
Net income allocated to common shareholders                 $ 19 $ 545 $ (119)
Additional income allocation for class B dilutive shares                 520 106 0
Adjusted net income (loss) allocated to common stockholders                 $ 539 $ 651 $ (119)
Add: Dilutive effects of purchase contracts                 0 0 0
Add: Dilutive effects of warrants                 383,255 115,997 0
Average shares and dilutive common shares (in shares)                 396,124 715,560 805,774
Diluted earnings per common share (in usd per share) $ 0.40 $ 0.29 $ 0.33 $ 0.30 $ 0.25 $ 0.31 $ 0.25 $ (0.01) $ 1.36 $ 0.91 $ (0.15)
Restricted Stock Units                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 138,646 52,286 0
Restricted Stock Units | Class A Common Stock                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 138,646 52,286 0
Restricted Stock Units | Class B Common Stock                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 0 0 0
Stock Option                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 30,014 8,692 0
Stock Option | Class A Common Stock                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 30,014 8,692 0
Stock Option | Class B Common Stock                      
Diluted:                      
Add: Dilutive effects of restricted stock units and stock options                 0 0 0