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SEGMENT REPORTING - Operating Segments' Financial Results (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 70,417 | $ 51,997 |
Provision for loan and lease losses | 321 | 0 |
Noninterest income | 51,959 | 45,980 |
Noninterest expense | 89,100 | 75,879 |
Income before income taxes | 32,955 | 22,098 |
Total assets | 9,616,972 | 6,097,355 | $ 8,235,555
Operating Segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 71,527 | 51,552 |
Provision for loan and lease losses | 321 | 0 |
Noninterest income | 22,831 | 7,855 |
Noninterest expense | 50,267 | 40,907 |
Income before income taxes | 43,770 | 18,500 |
Total assets | 9,096,759 | 5,684,574 |
Operating Segments | Mortgage Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,172 | 2,501 |
Provision for loan and lease losses | 0 | 0 |
Noninterest income | 28,131 | 36,928 |
Noninterest expense | 37,273 | 34,145 |
Income before income taxes | (5,970) | 5,284 |
Total assets | 506,934 | 406,215 |
Operating Segments | Financial Advisory |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 0 | 0 |
Provision for loan and lease losses | 0 | 0 |
Noninterest income | 1,815 | 2,622 |
Noninterest expense | 2,378 | 2,252 |
Income before income taxes | (563) | 370 |
Total assets | 11,763 | 2,987 |
Operating Segments | Corporate/ Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (4,282) | (2,056) |
Provision for loan and lease losses | 0 | 0 |
Noninterest income | 0 | 0 |
Noninterest expense | 0 | 0 |
Income before income taxes | (4,282) | (2,056) |
Total assets | 259,225 | 25,424 |
Inter-segment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 0 | 0 |
Provision for loan and lease losses | 0 | 0 |
Noninterest income | (818) | (1,425) |
Noninterest expense | (818) | (1,425) |
Income before income taxes | 0 | 0 |
Total assets | $ (257,709) | $ (21,845) |

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