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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018 are shown below.
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018
Balance at beginning of year |  | $ | 937,771 |  |  | $ | 880,251 |  |  | $ | 204,084 |
Goodwill resulting from business combinations |  | 0 |  |  | 57,520 |  |  | 676,167 |
Balance at end of year |  | $ | 937,771 |  |  | $ | 937,771 |  |  | $ | 880,251 |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization of other intangible assets at December 31, 2020 and December 31, 2019 were as follows:
(Dollars in thousands) |  | December 31, 2020 |  | December 31, 2019
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 51,031 |  |  | $ | (27,524) |  |  | $ | 51,031 |  |  | $ | (21,149) |
Customer list |  | 39,420 |  |  | (4,778) |  |  | 39,420 |  |  | (1,195) |
Other |  | 10,113 |  |  | (3,710) |  |  | 10,093 |  |  | (1,999) |
Total |  | $ | 100,564 |  |  | $ | (36,012) |  |  | $ | 100,544 |  |  | $ | (24,343) |
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
2021 |  | $ | 10,249 |
2022 |  | 7,708 |
2023 |  | 6,729 |
2024 |  | 6,660 |
2025 |  | 6,611 |

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