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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) - Quarterly Results of Operations (Unaudited) (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
Class of Stock [Line Items]                      
Interest income $ 74,199 $ 66,515 $ 64,844 $ 60,780 $ 55,080 $ 46,649 $ 43,634 $ 42,776 $ 266,338 $ 188,139 $ 120,511
Interest expense 12,133 10,965 10,740 8,783 8,749 8,463 8,059 7,591 42,621 32,862 23,282
Net interest income 62,066 55,550 54,104 51,997 46,331 38,186 35,575 35,185 223,717 155,277 97,229
Provision for loan losses 1,260 735 5,474 0 4,159 2,780 2,108 1,929 7,469 10,976 7,963
Noninterest income 56,819 50,727 66,693 45,980 40,889 44,098 35,372 25,278 220,219 145,637 96,743
Noninterest expense 86,659 81,743 87,920 75,879 78,220 67,354 60,304 57,594 332,201 263,472 178,101
Income before income taxes 30,966 23,799 27,403 22,098 4,841 12,150 8,535 940 104,266 26,466 7,908
Income tax expense (benefit) 11,928 9,263 11,479 9,524 (5,269) 903 436 191 42,194 (3,739) 7,992
Net income (loss) 19,038 14,536 15,924 12,574 10,110 11,247 8,099 749 62,072 30,205 (84)
Preferred stock dividends 3,030 3,040 2,843 910 910 910 910 910 9,823 3,640 2,185
Net income (loss) available to common stockholders $ 16,008 $ 11,496 $ 13,081 $ 11,664 $ 9,200 $ 10,337 $ 7,189 $ (161) $ 52,249 $ 26,565 $ (2,269)
Basic (loss) earnings per common share (in usd per share)                 $ 1.36 $ 0.91 $ (0.15)
Diluted (loss) earnings per common share (in usd per share)                 $ 1.34 $ 0.90 $ (0.15)
Class A Common Stock                      
Class of Stock [Line Items]                      
Net income (loss)                 $ 62,050 $ 29,559 $ (80)
Preferred stock dividends                 $ 9,820 $ 3,562 $ 2,070
Basic (loss) 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 (loss) 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                      
Class of Stock [Line Items]                      
Net income (loss)                 $ 22 $ 646 $ (4)
Preferred stock dividends                 $ 3 $ 78 $ 115
Basic (loss) 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 (loss) 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)