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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | $ 155,741 | $ 155,741
Accumulated amortization | (96,295) | (92,628)
Net carrying amount | 59,446 | 63,113
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Apr - Dec 2020 | 10,133 |
2021 | 11,786 |
2022 | 10,105 |
2023 | 8,457 |
2024 | 7,041 |
Thereafter | 11,924 |
Net carrying amount | 59,446 | 63,113
Components of goodwill [Abstract] |  |
Goodwill, beginning of period | 778,634 |
Goodwill, activity | (337) |
Goodwill, end of period | 778,297 |
Accumulated impairment, beginning of period | (4,824) |
Accumulated impairment, activity | 0 |
Accumulated impairment, end of period | (4,824) |
Goodwill, net, beginning of period | 773,810 |
Goodwill, net, activity | (337) |
Goodwill, net, end of period | 773,473 |
Core Deposit Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 66,475 | 66,475
Accumulated amortization | (51,474) | (50,057)
Net carrying amount | 15,001 | 16,418
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | 15,001 | 16,418
Other Intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross carrying amount | 89,266 | 89,266
Accumulated amortization | (44,821) | (42,571)
Net carrying amount | 44,445 | 46,695
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net carrying amount | $ 44,445 | $ 46,695

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