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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | $ 151,718 | $ 150,518
Accumulated amortization | (80,802) | (76,672)
Net carrying amount | 70,916 | 73,846
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Apr - Dec 2019 | 11,433 |
2020 | 12,956 |
2021 | 11,053 |
2022 | 9,483 |
2023 | 7,947 |
Thereafter | 18,044 |
Net carrying amount | 70,916 | 73,846
Components of goodwill [Abstract] |  |
Goodwill, beginning of period | 738,327 |
Goodwill, activity | 0 |
Goodwill, end of period | 738,327 |
Accumulated impairment, beginning of period | (4,824) |
Accumulated impairment, activity | 0 |
Accumulated impairment, end of period | (4,824) |
Goodwill, net, beginning of period | 733,503 |
Goodwill, net, activity | 0 |
Goodwill, net, end of period | 733,503 |
Core Deposit Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 62,902 | 62,902
Accumulated amortization | (45,789) | (44,306)
Net carrying amount | 17,113 | 18,596
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | 17,113 | 18,596
Other Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 88,816 | 87,616
Accumulated amortization | (35,013) | (32,366)
Net carrying amount | 53,803 | 55,250
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | $ 53,803 | $ 55,250

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