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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 146,669 | $ 57,541 |
Accumulated amortization | (53,819) | (41,839) |
Net carrying amount | 92,850 | 15,702 |
Estimated aggregate amortization expense [Abstract] |  |  |
Oct - Dec 2017 | 4,904 |  |
2018 | 17,259 |  |
2019 | 14,502 |  |
2020 | 12,043 |  |
2021 | 10,288 |  |
Thereafter | 33,854 |  |
Net carrying amount | 92,850 | 15,702 |
Components of goodwill [Abstract] |  |  |
Goodwill | 736,329 | 469,966 |
Goodwill, activity | 266,363 |  |
Accumulated impairment | (4,824) | (4,824) |
Accumulated impairment, activity | 0 |  |
Goodwill, net | 731,505 | 465,142 | $ 465,142
Goodwill, net, activity | 266,363 |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 62,902 | 39,688 |
Accumulated amortization | (36,101) | (32,581) |
Net carrying amount | 26,801 | 7,107 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | 26,801 | 7,107 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 83,767 | 17,853 |
Accumulated amortization | (17,718) | (9,258) |
Net carrying amount | 66,049 | 8,595 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | $ 66,049 | $ 8,595 |

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