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Business Segment Information - Banking Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Total interest income | $ 71,759 | $ 45,137 | $ 187,126 | $ 125,007 |
Total interest expense | 9,977 | 5,625 | 24,957 | 15,119 |
Net interest income | 61,782 | 39,512 | 162,169 | 109,888 |
Provision for loan losses | 6,803 | 572 | 14,257 | 9,697 |
Net interest income after provision for loan losses | 54,979 | 38,940 | 147,912 | 100,191 |
Gain on sale of subsidiary or division |  |  | 1,071 | 20,860 |
Other noninterest income |  |  | 15,105 | 15,798 |
Noninterest income | 6,059 | 4,171 | 16,176 | 36,658 |
Noninterest expense | 48,946 | 28,225 | 120,391 | 90,383 |
Net income before income tax | 12,092 | 14,886 | 43,697 | 46,466 |
Total assets | 4,537,102 |  | 4,537,102 |  | $ 3,499,033
Gross loans | 3,512,143 |  | 3,512,143 |  | 2,810,856
Operating Segments | Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total interest income | 43,769 | 32,973 | 123,050 | 93,204 |
Intersegment interest allocations | 6,289 | 2,193 | 13,377 | 5,211 |
Total interest expense | 8,426 | 4,294 | 20,421 | 11,177 |
Net interest income | 41,632 | 30,872 | 116,006 | 87,238 |
Provision for loan losses | 6,774 | (69) | 10,510 | 7,571 |
Net interest income after provision for loan losses | 34,858 | 30,941 | 105,496 | 79,667 |
Gain on sale of subsidiary or division |  |  | 1,071 |  |
Other noninterest income |  |  | 12,612 | 10,604 |
Noninterest income | 4,991 | 3,498 |  |  |
Noninterest expense | 33,507 | 21,984 | 86,446 | 65,171 |
Net income before income tax | 6,342 | 12,455 | 32,733 | 25,100 |
Total assets | 4,433,862 |  | 4,433,862 |  | 3,444,322
Gross loans | 3,411,456 |  | 3,411,456 |  | 2,784,147
Operating Segments | Factoring |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total interest income | 27,420 | 11,736 | 62,514 | 30,828 |
Intersegment interest allocations | (6,289) | (2,193) | (13,377) | (5,211) |
Net interest income | 21,131 | 9,543 | 49,137 | 25,617 |
Provision for loan losses | 41 | 649 | 3,747 | 2,042 |
Net interest income after provision for loan losses | 21,090 | 8,894 | 45,390 | 23,575 |
Other noninterest income |  |  | 2,452 | 2,203 |
Noninterest income | 942 | 774 |  |  |
Noninterest expense | 12,902 | 5,600 | 30,067 | 16,677 |
Net income before income tax | 9,130 | 4,068 | 17,775 | 9,101 |
Total assets | 659,782 |  | 659,782 |  | 360,922
Gross loans | 579,985 |  | 579,985 |  | 346,293
Operating Segments | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total interest income | 570 | 428 | 1,562 | 975 |
Total interest expense | 1,551 | 1,331 | 4,536 | 3,942 |
Net interest income | (981) | (903) | (2,974) | (2,967) |
Provision for loan losses | (12) | (8) |  | 84 |
Net interest income after provision for loan losses | (969) | (895) | (2,974) | (3,051) |
Gain on sale of subsidiary or division |  |  |  | 20,860 |
Other noninterest income |  |  | 41 | 2,991 |
Noninterest income | 126 | (101) |  |  |
Noninterest expense | 2,537 | 641 | 3,878 | 8,535 |
Net income before income tax | (3,380) | $ (1,637) | (6,811) | $ 12,265 |
Total assets | 712,971 |  | 712,971 |  | 504,656
Gross loans | 10,952 |  | 10,952 |  | 11,936
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | (1,269,513) |  | (1,269,513) |  | (810,867)
Gross loans | $ (490,250) |  | $ (490,250) |  | $ (331,520)

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