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SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Information about reportable segments |  |  |  |  |
Net interest income | $ 61,394 | $ 60,601 | $ 182,672 | $ 177,458 |
Provision for loan losses | 1,747 | 2,093 | 4,647 | 4,807 |
Noninterest income | 31,072 | 27,594 | 89,092 | 80,801 |
Amortization of intangible assets | 1,051 | 1,089 | 3,293 | 3,408 |
Other operating expenses | 57,760 | 53,955 | 166,603 | 160,564 |
Income before income taxes | 31,908 | 31,058 | 97,221 | 89,480 |
Assets | 7,502,643 | 7,302,017 | 7,502,643 | 7,302,017 | 7,095,864
Goodwill | 375,174 | 369,703 | 375,174 | 369,703 | 374,991
Eliminations [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | (486) | (357) | (1,365) | (1,210) |
Amortization of intangible assets | 0 | 0 | 0 | 0 |
Other operating expenses | (486) | (357) | (1,365) | (1,210) |
Income before income taxes | 0 | 0 | 0 | 0 |
Assets | (17,957) | (14,519) | (17,957) | (14,519) |
Goodwill | 0 | 0 | 0 | 0 |
Banking [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 61,350 | 60,566 | 182,537 | 177,319 |
Provision for loan losses | 1,747 | 2,093 | 4,647 | 4,807 |
Noninterest income | 15,700 | 14,372 | 43,922 | 40,667 |
Amortization of intangible assets | 850 | 875 | 2,644 | 2,720 |
Other operating expenses | 46,837 | 43,497 | 133,680 | 129,674 |
Income before income taxes | 27,616 | 28,473 | 85,488 | 80,785 |
Assets | 7,476,030 | 7,276,673 | 7,476,030 | 7,276,673 |
Goodwill | 364,495 | 359,207 | 364,495 | 359,207 |
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 21 | 16 | 67 | 81 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | 11,049 | 9,619 | 32,434 | 29,249 |
Amortization of intangible assets | 153 | 157 | 496 | 507 |
Other operating expenses | 8,140 | 7,810 | 24,622 | 23,019 |
Income before income taxes | 2,777 | 1,668 | 7,383 | 5,804 |
Assets | 29,605 | 27,228 | 29,605 | 27,228 |
Goodwill | 8,019 | 7,836 | 8,019 | 7,836 |
Wealth Management [Member] | Operating Segments [Member] |  |  |  |  |
Information about reportable segments |  |  |  |  |
Net interest income | 23 | 19 | 68 | 58 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | 4,809 | 3,960 | 14,101 | 12,095 |
Amortization of intangible assets | 48 | 57 | 153 | 181 |
Other operating expenses | 3,269 | 3,005 | 9,666 | 9,081 |
Income before income taxes | 1,515 | 917 | 4,350 | 2,891 |
Assets | 14,965 | 12,635 | 14,965 | 12,635 |
Goodwill | $ 2,660 | $ 2,660 | $ 2,660 | $ 2,660 |

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