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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021, 2020 and 2019 are shown below.
(Dollars in thousands) |  | 2021 |  | 2020 |  | 2019
Balance at beginning of year |  | $ | 937,771 |  |  | $ | 937,771 |  |  | $ | 880,251 |
Goodwill resulting from business combinations |  | 62,978 |  |  | 0 |  |  | 57,520 |
Balance at end of year |  | $ | 1,000,749 |  |  | $ | 937,771 |  |  | $ | 937,771 |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization of other intangible assets were as follows:
(Dollars in thousands) |  | December 31, 2021 |  | December 31, 2020
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 45,256 |  |  | $ | (26,911) |  |  | $ | 51,031 |  |  | $ | (27,524) |
Customer list |  | 69,563 |  |  | (8,362) |  |  | 39,420 |  |  | (4,778) |
Other |  | 14,589 |  |  | (5,237) |  |  | 10,113 |  |  | (3,710) |
Total |  | $ | 129,408 |  |  | $ | (40,510) |  |  | $ | 100,564 |  |  | $ | (36,012) |
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
2022 |  | $ | 11,515 |
2023 |  | 10,536 |
2024 |  | 9,193 |
2025 |  | 9,145 |
2026 |  | 9,092 |

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