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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Information about reportable segments [Abstract] |  |  |  |  |
Net interest income | $ 86,846 | $ 78,029 | $ 171,470 | $ 145,303 |
Provision for loan losses | 2,448 | 1,461 | 6,127 | 3,289 |
Noninterest revenues | 56,559 | 51,226 | 114,050 | 95,544 |
Amortization of intangible assets | 4,555 | 4,263 | 9,353 | 7,031 |
Acquisition expenses | 71 | 22,896 | 63 | 24,612 |
Other operating expenses | 81,486 | 75,720 | 163,027 | 144,811 |
Income before income taxes | 54,845 | 24,915 | 106,950 | 61,104 |
Assets | 10,633,094 | 10,884,046 | 10,633,094 | 10,884,046 | $ 10,746,198
Goodwill | 733,479 | 733,604 | 733,479 | 733,604 | $ 734,430
Eliminations [Member] |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | (700) | (687) | (1,395) | (1,351) |
Amortization of intangible assets | 0 | 0 | 0 | 0 |
Acquisition expenses | 0 | 0 | 0 | 0 |
Other operating expenses | (700) | (687) | (1,395) | (1,351) |
Income before income taxes | 0 | 0 | 0 | 0 |
Assets | (53,663) | (43,533) | (53,663) | (43,533) |
Goodwill | 0 | 0 | 0 | 0 |
Banking [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |
Net interest income | 86,723 | 77,872 | 171,253 | 145,006 |
Provision for loan losses | 2,448 | 1,461 | 6,127 | 3,289 |
Noninterest revenues | 20,040 | 18,062 | 40,397 | 33,929 |
Amortization of intangible assets | 1,635 | 1,170 | 3,379 | 1,724 |
Acquisition expenses | 65 | 22,729 | 50 | 23,250 |
Other operating expenses | 57,464 | 53,890 | 114,418 | 103,383 |
Income before income taxes | 45,151 | 16,684 | 87,676 | 47,289 |
Assets | 10,415,083 | 10,635,177 | 10,415,083 | 10,635,177 |
Goodwill | 629,916 | 631,148 | 629,916 | 631,148 |
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |
Net interest income | 93 | 94 | 163 | 172 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | 23,051 | 21,118 | 46,500 | 38,754 |
Amortization of intangible assets | 1,989 | 2,343 | 4,077 | 3,933 |
Acquisition expenses | 0 | 117 | 7 | 1,179 |
Other operating expenses | 14,204 | 13,068 | 27,914 | 24,438 |
Income before income taxes | 6,951 | 5,684 | 14,665 | 9,376 |
Assets | 207,114 | 217,020 | 207,114 | 217,020 |
Goodwill | 83,275 | 84,552 | 83,275 | 84,552 |
All Other [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |
Net interest income | 30 | 63 | 54 | 125 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest revenues | 14,168 | 12,733 | 28,548 | 24,212 |
Amortization of intangible assets | 931 | 750 | 1,897 | 1,374 |
Acquisition expenses | 6 | 50 | 6 | 183 |
Other operating expenses | 10,518 | 9,449 | 22,090 | 18,341 |
Income before income taxes | 2,743 | 2,547 | 4,609 | 4,439 |
Assets | 64,560 | 75,382 | 64,560 | 75,382 |
Goodwill | $ 20,288 | $ 17,904 | $ 20,288 | $ 17,904 |

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