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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018 and 2017 are shown below.
(Dollars in thousands) |  | 2019 |  | 2018 |  | 2017
Balance at beginning of year |  | $ | 880,251 |  |  | $ | 204,084 |  |  | $ | 204,084 |
Goodwill resulting from business combinations |  | 57,520 |  |  | 676,167 |  |  | 0 |
Balance at end of year |  | $ | 937,771 |  |  | $ | 880,251 |  |  | $ | 204,084 |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization of other intangible assets at December 31, 2019 and December 31, 2018 were as follows:
(Dollars in thousands) |  | December 31, 2019 |  | December 31, 2018
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 51,031 |  |  | $ | (21,149 | ) |  | $ | 54,357 |  |  | $ | (16,500 | )
Customer list |  | 39,420 |  |  | (1,195 | ) |  | 0 |  |  | 0 |
Other |  | 10,093 |  |  | (1,999 | ) |  | 3,763 |  |  | (815 | )
Total |  | $ | 100,544 |  |  | $ | (24,343 | ) |  | $ | 58,120 |  |  | $ | (17,315 | )
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The estimated amortization expense of intangible assets for the next five years is as follows:
(Dollars in thousands) |  | Intangible amortization
2020 |  | $ | 11,670 |
2021 |  | 10,263 |
2022 |  | 7,718 |
2023 |  | 6,739 |
2024 |  | 6,670 |

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