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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)