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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 57,540 | $ 57,253 |
Accumulated amortization | (40,563) | (36,359) |
Net carrying amount | 16,977 | 20,894 |
Estimated aggregate amortization expense [Abstract] |  |  |
Oct - Dec 2016 | 1,275 |  |
2017 | 4,413 |  |
2018 | 3,566 |  |
2019 | 2,782 |  |
2020 | 2,119 |  |
Thereafter | 2,822 |  |
Net carrying amount | 16,977 | 20,894 |
Components of goodwill [Abstract] |  |  |
Goodwill | 469,966 | 468,076 |
Goodwill, activity | 1,890 |  |
Accumulated impairment | (4,824) | (4,824) |
Accumulated impairment, activity | 0 |  |
Goodwill, net | 465,142 | 463,252 | $ 375,174
Goodwill, net, activity | 1,890 |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 39,688 | 39,688 |
Accumulated amortization | (31,975) | (29,899) |
Net carrying amount | 7,713 | 9,789 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | 7,713 | 9,789 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 17,852 | 17,565 |
Accumulated amortization | (8,588) | (6,460) |
Net carrying amount | 9,264 | 11,105 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | $ 9,264 | $ 11,105 |

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