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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the years ended December 31, 2018, 2017 and 2016 are shown below.
(Dollars in thousands) |  | 2018 |  | 2017 |  | 2016
Balance at beginning of year |  | $ | 204,084 |  |  | $ | 204,084 |  |  | $ | 204,084 |
Goodwill resulting from business combinations |  | 676,167 |  |  | 0 |  |  | 0 |
Balance at end of year |  | $ | 880,251 |  |  | $ | 204,084 |  |  | $ | 204,084 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated amortization expense of intangible assets for the next five years is as follows:
(Dollars in thousands) |  |
2019 |  | $ | 8,800 |
2020 |  | 7,010 |
2021 |  | 5,602 |
2022 |  | 3,417 |
2023 |  | 3,155 |

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