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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)

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