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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) - Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 97,157 | $ 96,751 | $ 96,440 | $ 98,842 | $ 99,731 | $ 98,122 | $ 90,929 | $ 81,062 | $ 389,190 | $ 369,844 | $ 253,807
Interest expense | 23,984 | 21,715 | 20,940 | 18,361 | 16,799 | 15,274 | 13,603 | 13,823 | 85,000 | 59,499 | 42,621
Net interest income | 73,173 | 75,036 | 75,500 | 80,481 | 82,932 | 82,848 | 77,326 | 67,239 | 304,190 | 310,345 | 211,186
Provision for loan losses | 5,052 | 3,561 | 2,503 | 2,583 | 589 | 2,592 | 1,769 | 321 | 13,699 | 5,271 | 7,469
Noninterest income | 5,695 | 18,365 | 5,707 | 14,903 | 32,504 | 22,030 | 22,903 | 21,193 | 44,670 | 98,630 | 75,748
Noninterest expense | 66,382 | 75,671 | 76,319 | 89,896 | 92,895 | 86,123 | 65,053 | 59,144 | 308,268 | 303,215 | 210,299
Income from continuing operations before income taxes | 7,434 | 14,169 | 2,385 | 2,905 | 21,952 | 16,163 | 33,407 | 28,967 | 26,893 | 100,489 | 69,166
Income tax (benefit) expense | (3,418) | (3,939) | (12,753) | (6,471) | (2,543) | (9,016) | 13,647 | 11,661 | (26,581) | 13,749 | 28,048
Income from continuing operations | 10,852 | 18,108 | 15,138 | 9,376 | 24,495 | 25,179 | 19,760 | 17,306 | 53,474 | 86,740 | 41,118
Income (loss) from discontinued operations before income taxes | 765 | (1,958) | (4,991) | 13,348 | 14,965 | 18,574 | 11,390 | 3,988 | 7,164 | 48,917 | 35,100
Income tax (benefit) expense | 315 | (799) | (2,110) | 5,523 | 6,196 | 7,816 | 4,622 | 1,607 | 2,929 | 20,241 | 14,146
Income (loss) from discontinued operations | 450 | (1,159) | (2,881) | 7,825 | 8,769 | 10,758 | 6,768 | 2,381 | 4,235 | 28,676 | 20,954
Net income | 11,302 | 16,949 | 12,257 | 17,201 | 33,264 | 35,937 | 26,528 | 19,687 | 57,709 | 115,416 | 62,072
Dividends on preferred stock | 5,113 | 5,112 | 5,113 | 5,113 | 5,113 | 5,112 | 5,114 | 4,575 | 20,451 | 19,914 | 9,823
Net income allocated to common stockholders | $ 6,189 | $ 11,837 | $ 7,144 | $ 12,088 | $ 28,151 | $ 30,825 | $ 21,414 | $ 15,112 | $ 36,136 | $ 92,469 | $ 50,226
Basic earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.64 | $ 1.36 | $ 0.79
Income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.08 | 0.61 | 0.57
Net income (in dollars per share) |  |  |  |  |  |  |  |  | 0.72 | 1.97 | 1.36
Diluted earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.63 | 1.34 | 0.78
Income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.08 | 0.60 | 0.56
Net income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.71 | $ 1.94 | $ 1.34
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 53,136 | $ 86,500 | $ 41,103
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 4,208 | 28,597 | 20,947
Dividends on preferred stock |  |  |  |  |  |  |  |  | 20,322 | 19,859 | 9,820
Net income allocated to common stockholders |  |  |  |  |  |  |  |  | $ 35,907 | $ 92,213 | $ 50,207
Basic earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 0.11 | $ 0.25 | $ 0.20 | $ 0.08 | $ 0.37 | $ 0.38 | $ 0.30 | $ 0.30 | $ 0.64 | $ 1.36 | $ 0.79
Income from discontinued operations (in dollars per share) | 0.01 | (0.02) | (0.06) | 0.15 | 0.18 | 0.22 | 0.14 | 0.06 | 0.08 | 0.61 | 0.57
Net income (in dollars per share) | 0.12 | 0.23 | 0.14 | 0.23 | 0.55 | 0.60 | 0.44 | 0.36 | 0.72 | 1.97 | 1.36
Diluted earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | 0.11 | 0.25 | 0.20 | 0.08 | 0.36 | 0.38 | 0.29 | 0.30 | 0.63 | 1.34 | 0.78
Income from discontinued operations (in dollars per share) | 0.01 | (0.02) | (0.06) | 0.15 | 0.18 | 0.21 | 0.14 | 0.06 | 0.08 | 0.60 | 0.56
Net income (in dollars per share) | 0.12 | 0.23 | 0.14 | 0.23 | 0.54 | 0.59 | 0.43 | 0.36 | $ 0.71 | $ 1.94 | $ 1.34
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 338 | $ 240 | $ 15
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 27 | 79 | 7
Dividends on preferred stock |  |  |  |  |  |  |  |  | 129 | 55 | 3
Net income allocated to common stockholders |  |  |  |  |  |  |  |  | $ 229 | $ 256 | $ 19
Basic earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | 0.11 | 0.25 | 0.20 | 0.08 | 0.37 | 0.38 | 0.30 | 0.30 | $ 0.64 | $ 1.36 | $ 0.79
Income from discontinued operations (in dollars per share) | 0.01 | (0.02) | (0.06) | 0.15 | 0.18 | 0.22 | 0.14 | 0.06 | 0.08 | 0.61 | 0.57
Net income (in dollars per share) | 0.12 | 0.23 | 0.14 | 0.23 | 0.55 | 0.60 | 0.44 | 0.36 | 0.72 | 1.97 | 1.36
Diluted earnings per common share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | 0.11 | 0.25 | 0.20 | 0.08 | 0.37 | 0.38 | 0.30 | 0.30 | 0.64 | 1.36 | 0.79
Income from discontinued operations (in dollars per share) | 0.01 | (0.02) | (0.06) | 0.15 | 0.18 | 0.22 | 0.14 | 0.06 | 0.08 | 0.61 | 0.57
Net income (in dollars per share) | $ 0.12 | $ 0.23 | $ 0.14 | $ 0.23 | $ 0.55 | $ 0.60 | $ 0.44 | $ 0.36 | $ 0.72 | $ 1.97 | $ 1.36

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