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SEGMENT REPORTING - Operating Segments' Financial Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | $ 81,037 | $ 54,104 | $ 151,454 | $ 106,101 |
Provision for loan and lease losses | 1,769 | 5,474 | 2,090 | 5,474 |
Noninterest income | 65,604 | 66,693 | 117,563 | 112,673 |
Noninterest expense | 100,075 | 87,920 | 189,175 | 163,799 |
Income before income taxes | 44,797 | 27,403 | 77,752 | 49,501 |
Total assets | 10,157,662 | 6,437,882 | 10,157,662 | 6,437,882 | $ 8,235,555
Operating Segments | Commercial Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 80,181 | 54,889 | 151,708 | 106,441 |
Provision for loan and lease losses | 1,769 | 5,474 | 2,090 | 5,474 |
Noninterest income | 20,691 | 21,489 | 43,522 | 29,344 |
Noninterest expense | 54,055 | 46,235 | 104,322 | 87,142 |
Income before income taxes | 45,048 | 24,669 | 88,818 | 43,169 |
Total assets | 9,706,188 | 5,962,659 | 9,706,188 | 5,962,659 |
Operating Segments | Mortgage Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 3,706 | 3,486 | 6,878 | 5,987 |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |
Noninterest income | 40,708 | 40,690 | 68,839 | 77,618 |
Noninterest expense | 42,772 | 38,616 | 80,045 | 72,761 |
Income before income taxes | 1,642 | 5,560 | (4,328) | 10,844 |
Total assets | 447,580 | 465,971 | 447,580 | 465,971 |
Operating Segments | Financial Advisory |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |
Noninterest income | 821 | 5,896 | 2,636 | 8,518 |
Noninterest expense | 821 | 4,451 | 3,199 | 6,703 |
Income before income taxes | 0 | 1,445 | (563) | 1,815 |
Total assets | 0 | 7,311 | 0 | 7,311 |
Operating Segments | Corporate/ Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | (2,850) | (4,271) | (7,132) | (6,327) |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |
Noninterest income | 3,694 | 0 | 3,694 | 0 |
Noninterest expense | 2,737 | 0 | 2,737 | 0 |
Income before income taxes | (1,893) | (4,271) | (6,175) | (6,327) |
Total assets | 113,237 | 240,518 | 113,237 | 240,518 |
Inter-segment Elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |
Noninterest income | (310) | (1,382) | (1,128) | (2,807) |
Noninterest expense | (310) | (1,382) | (1,128) | (2,807) |
Income before income taxes | 0 | 0 | 0 | 0 |
Total assets | $ (109,343) | $ (238,577) | $ (109,343) | $ (238,577) |

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