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GOODWILL (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill |
(Dollars in thousands) | September 30, 2018 |  | December 31, 2017
Balance at beginning of year | $ | 204,084 |  |  | $ | 204,084 |
Goodwill resulting from business combinations | 676,949 |  |  | 0 |
Balance at end of period | $ | 881,033 |  |  | $ | 204,084 |

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