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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 150,274 | $ 149,437
Accumulated amortization | (63,315) | (58,779)
Net carrying amount | 86,959 | 90,658
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Apr - Dec 2018 | 13,318 |
2019 | 15,247 |
2020 | 12,680 |
2021 | 10,817 |
2022 | 9,288 |
Thereafter | 25,609 |
Net carrying amount | 86,959 | 90,658
Components of goodwill [Abstract] |  |
Goodwill, beginning of period | 739,254 |
Goodwill, activity | (805) |
Goodwill, end of period | 738,449 |
Accumulated impairment, beginning of period | (4,824) |
Accumulated impairment, activity | 0 |
Accumulated impairment, end of period | (4,824) |
Goodwill, net, beginning of period | 734,430 |
Goodwill, net, activity | (805) |
Goodwill, net, end of period | 733,625 |
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 62,902 | 62,902
Accumulated amortization | (39,621) | (37,877)
Net carrying amount | 23,281 | 25,025
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | 23,281 | 25,025
Other Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 87,372 | 86,535
Accumulated amortization | (23,694) | (20,902)
Net carrying amount | 63,678 | 65,633
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | $ 63,678 | $ 65,633

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