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SEGMENT REPORTING - Operating Segments' Financial Results (Details) - USD ($) $ 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 and lease 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
Total assets | 8,235,555 |  |  |  | 5,971,297 |  |  |  | 8,235,555 | 5,971,297 | 3,627,862
Operating Segments | Commercial Banking |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 225,869 | 154,322 | 96,222
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 7,469 | 10,976 | 7,963
Noninterest income |  |  |  |  |  |  |  |  | 65,829 | 34,122 | 26,740
Noninterest expense |  |  |  |  |  |  |  |  | 183,918 | 150,539 | 88,449
Income before income taxes |  |  |  |  |  |  |  |  | 100,311 | 26,929 | 26,550
Total assets | 7,785,887 |  |  |  | 5,648,986 |  |  |  | 7,785,887 | 5,648,986 | 3,395,793
Operating Segments | Mortgage Banking |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 12,502 | 8,455 | 7,792
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 144,522 | 98,322 | 69,687
Noninterest expense |  |  |  |  |  |  |  |  | 143,912 | 96,103 | 76,210
Income before income taxes |  |  |  |  |  |  |  |  | 13,112 | 10,674 | 1,269
Total assets | 445,509 |  |  |  | 309,241 |  |  |  | 445,509 | 309,241 | 222,269
Operating Segments | Financial Advisory |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 15,960 | 19,697 | 2,832
Noninterest expense |  |  |  |  |  |  |  |  | 10,463 | 11,071 | 2,339
Income before income taxes |  |  |  |  |  |  |  |  | 5,497 | 8,626 | 493
Total assets | 11,865 |  |  |  | 14,957 |  |  |  | 11,865 | 14,957 | 2,876
Operating Segments | Corporate/ Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | (14,654) | (7,500) | (6,785)
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 0 | 217 | 5
Noninterest expense |  |  |  |  |  |  |  |  | 0 | 12,480 | 13,624
Income before income taxes |  |  |  |  |  |  |  |  | (14,654) | (19,763) | (20,404)
Total assets | 157,944 |  |  |  | 60,593 |  |  |  | 157,944 | 60,593 | 33,974
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | (6,092) | (6,721) | (2,521)
Noninterest expense |  |  |  |  |  |  |  |  | (6,092) | (6,721) | (2,521)
Income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ (165,650) |  |  |  | $ (62,480) |  |  |  | $ (165,650) | $ (62,480) | $ (27,050)

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