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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | $ 150,518 | $ 149,437
Accumulated amortization | (67,870) | (58,779)
Net carrying amount | 82,648 | 90,658
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Jul - Dec 2018 | 8,802 |
2019 | 15,296 |
2020 | 12,722 |
2021 | 10,853 |
2022 | 9,317 |
Thereafter | 25,658 |
Net carrying amount | 82,648 | 90,658
Components of goodwill [Abstract] |  |
Goodwill, beginning of period | 739,254 |
Goodwill, activity | (951) |
Goodwill, end of period | 738,303 |
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 | (951) |
Goodwill, net, end of period | 733,479 |
Core Deposit Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 62,902 | 62,902
Accumulated amortization | (41,256) | (37,877)
Net carrying amount | 21,646 | 25,025
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | 21,646 | 25,025
Other Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 87,616 | 86,535
Accumulated amortization | (26,614) | (20,902)
Net carrying amount | 61,002 | 65,633
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | $ 61,002 | $ 65,633

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