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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 120,598 | $ 57,541 |
Accumulated amortization | (44,607) | (41,839) |
Net carrying amount | 75,991 | 15,702 |
Estimated aggregate amortization expense [Abstract] |  |  |
Apr - Dec 2017 | 10,496 |  |
2018 | 11,918 |  |
2019 | 9,886 |  |
2020 | 8,150 |  |
2021 | 7,119 |  |
Thereafter | 28,422 |  |
Net carrying amount | 75,991 | 15,702 |
Components of goodwill [Abstract] |  |  |
Goodwill | 547,810 | 469,966 |
Goodwill, activity | 77,844 |  |
Accumulated impairment | (4,824) | (4,824) |
Accumulated impairment, activity | 0 |  |
Goodwill, net | 542,986 | 465,142 | $ 465,142
Goodwill, net, activity | 77,844 |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 39,688 | 39,688 |
Accumulated amortization | (33,135) | (32,581) |
Net carrying amount | 6,553 | 7,107 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | 6,553 | 7,107 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 80,910 | 17,853 |
Accumulated amortization | (11,472) | (9,258) |
Net carrying amount | 69,438 | 8,595 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net carrying amount | $ 69,438 | $ 8,595 |

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