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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Information about reportable segments [Abstract] |  |  |
Net interest income | $ 315,675 | $ 273,896 | $ 248,420
(Benefit)/provision for loan losses | 10,984 | 8,076 | 6,447
Noninterest income | 202,423 | 155,625 | 123,299
Amortization of intangible assets | 16,941 | 5,479 | 3,663
Acquisition expenses | 25,986 | 1,706 | 7,037
Other operating expenses | 304,222 | 259,663 | 222,355
Income before income taxes | 159,965 | 154,597 | 132,217
Assets | 10,746,198 | 8,666,437 | 8,552,669
Goodwill | 734,430 | 465,142 | 463,252
Eliminations [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 0 | 0 | 0
(Benefit)/provision for loan losses | 0 | 0 | 0
Noninterest income | (2,858) | (2,442) | (2,156)
Amortization of intangible assets | 0 | 0 | 0
Acquisition expenses | 0 | 0 | 0
Other operating expenses | (2,858) | (2,442) | (2,156)
Income before income taxes | 0 | 0 | 0
Assets | (29,638) | (41,790) | (65,637)
Goodwill | 0 | 0 | 0
Banking [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 315,025 | 273,542 | 248,167
(Benefit)/provision for loan losses | 10,984 | 8,076 | 6,447
Noninterest income | 73,337 | 66,059 | 57,704
Amortization of intangible assets | 5,296 | 2,682 | 2,803
Acquisition expenses | 24,549 | 1,005 | 6,947
Other operating expenses | 218,608 | 190,263 | 174,918
Income before income taxes | 128,925 | 137,575 | 114,756
Assets | 10,505,919 | 8,598,057 | 8,513,228
Goodwill | 629,916 | 440,870 | 439,052
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 396 | 162 | 132
(Benefit)/provision for loan losses | 0 | 0 | 0
Noninterest income | 82,743 | 48,261 | 46,784
Amortization of intangible assets | 8,578 | 420 | 515
Acquisition expenses | 1,194 | 445 | 21
Other operating expenses | 51,138 | 36,892 | 35,197
Income before income taxes | 22,229 | 10,666 | 11,183
Assets | 203,369 | 38,742 | 35,011
Goodwill | 84,449 | 8,019 | 8,019
All Other [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 254 | 192 | 121
(Benefit)/provision for loan losses | 0 | 0 | 0
Noninterest income | 49,201 | 43,747 | 20,967
Amortization of intangible assets | 3,067 | 2,377 | 345
Acquisition expenses | 243 | 256 | 69
Other operating expenses | 37,334 | 34,950 | 14,396
Income before income taxes | 8,811 | 6,356 | 6,278
Assets | 66,548 | 71,428 | 70,067
Goodwill | $ 20,065 | $ 16,253 | $ 16,181

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