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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Information about reportable segments [Abstract] |  |  |
Net interest income | $ 273,896 | $ 248,420 | $ 244,428
Provision for loan losses | 8,076 | 6,447 | 7,178
Noninterest income | 155,625 | 123,299 | 119,020
Amortization of intangible assets | 5,479 | 3,663 | 4,287
Other operating expenses | 261,369 | 229,392 | 222,293
Income before income taxes | 154,597 | 132,217 | 129,690
Assets | 8,666,437 | 8,552,669 | 7,489,440
Goodwill | 465,142 | 463,252 | 375,174
Eliminations [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 0 | 0 | 0
Provision for loan losses | 0 | 0 | 0
Noninterest income | (2,442) | (2,156) | (1,880)
Amortization of intangible assets | 0 | 0 | 0
Other operating expenses | (2,442) | (2,156) | (1,880)
Income before income taxes | 0 | 0 | 0
Assets | (41,790) | (65,637) | (21,087)
Goodwill | 0 | 0 | 0
Banking [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 273,542 | 248,167 | 244,243
Provision for loan losses | 8,076 | 6,447 | 7,178
Noninterest income | 66,059 | 57,704 | 58,565
Amortization of intangible assets | 2,682 | 2,803 | 3,438
Other operating expenses | 191,268 | 181,865 | 178,472
Income before income taxes | 137,575 | 114,756 | 113,720
Assets | 8,598,057 | 8,513,228 | 7,463,379
Goodwill | 440,870 | 439,052 | 364,495
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 162 | 132 | 92
Provision for loan losses | 0 | 0 | 0
Noninterest income | 48,261 | 46,784 | 43,701
Amortization of intangible assets | 420 | 515 | 647
Other operating expenses | 37,337 | 35,218 | 32,846
Income before income taxes | 10,666 | 11,183 | 10,300
Assets | 38,742 | 35,011 | 31,513
Goodwill | 8,019 | 8,019 | 8,019
All Other [Member] | Operating Segments [Member] |  |  |
Information about reportable segments [Abstract] |  |  |
Net interest income | 192 | 121 | 93
Provision for loan losses | 0 | 0 | 0
Noninterest income | 43,747 | 20,967 | 18,634
Amortization of intangible assets | 2,377 | 345 | 202
Other operating expenses | 35,206 | 14,465 | 12,855
Income before income taxes | 6,356 | 6,278 | 5,670
Assets | 71,428 | 70,067 | 15,635
Goodwill | $ 16,253 | $ 16,181 | $ 2,660

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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