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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Information about reportable segments |  |  |  |  |
Net interest income | $ 84,395 | $ 68,463 | $ 229,698 | $ 203,650 |
Provision for loan losses | 2,314 | 1,790 | 5,603 | 5,436 |
Noninterest revenues | 52,941 | 39,952 | 148,485 | 117,005 |
Amortization of intangible assets | 4,949 | 1,359 | 11,980 | 4,204 |
Acquisition expenses | 580 | 2 | 25,192 | 342 |
Other operating expenses | 78,247 | 64,865 | 223,058 | 195,705 |
Income before income taxes | 51,246 | 40,399 | 112,350 | 114,968 |
Assets | 10,850,218 | 8,727,746 | 10,850,218 | 8,727,746 | $ 8,666,437
Goodwill | 731,505 | 465,142 | 731,505 | 465,142 | $ 465,142
Eliminations [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | (684) | (623) | (2,035) | (1,784) |
Amortization of intangible assets | 0 | 0 | 0 | 0 |
Acquisition expenses | 0 | 0 | 0 | 0 |
Other operating expenses | (684) | (623) | (2,035) | (1,784) |
Income before income taxes | 0 | 0 | 0 | 0 |
Assets | (67,461) | (39,415) | (67,461) | (39,415) |
Goodwill | 0 | 0 | 0 | 0 |
Banking [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 84,227 | 68,375 | 229,233 | 203,394 |
Provision for loan losses | 2,314 | 1,790 | 5,603 | 5,436 |
Noninterest revenues | 20,120 | 17,756 | 54,049 | 49,663 |
Amortization of intangible assets | 1,796 | 665 | 3,520 | 2,075 |
Acquisition expenses | 534 | 2 | 23,784 | 101 |
Other operating expenses | 56,926 | 47,736 | 160,311 | 143,781 |
Income before income taxes | 42,777 | 35,938 | 90,064 | 101,664 |
Assets | 10,613,065 | 8,658,308 | 10,613,065 | 8,658,308 |
Goodwill | 629,153 | 440,870 | 629,153 | 440,870 |
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 104 | 39 | 276 | 117 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | 21,207 | 11,680 | 59,961 | 36,137 |
Amortization of intangible assets | 2,323 | 96 | 6,256 | 326 |
Acquisition expenses | 11 | 0 | 1,190 | 0 |
Other operating expenses | 12,788 | 9,020 | 37,225 | 27,899 |
Income before income taxes | 6,189 | 2,603 | 15,566 | 8,029 |
Assets | 226,812 | 36,706 | 226,812 | 36,706 |
Goodwill | 84,448 | 8,019 | 84,448 | 8,019 |
All Other [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 64 | 49 | 189 | 139 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | 12,298 | 11,139 | 36,510 | 32,989 |
Amortization of intangible assets | 830 | 598 | 2,204 | 1,803 |
Acquisition expenses | 35 | 0 | 218 | 241 |
Other operating expenses | 9,217 | 8,732 | 27,557 | 25,809 |
Income before income taxes | 2,280 | 1,858 | 6,720 | 5,275 |
Assets | 77,802 | 72,147 | 77,802 | 72,147 |
Goodwill | $ 17,904 | $ 16,253 | $ 17,904 | $ 16,253 |

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