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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022, 2021 and 2020 are shown below.
(Dollars in thousands) |  | 2022 |  | 2021 |  | 2020
Balance at beginning of year |  | $ | 1,000,749 |  |  | $ | 937,771 |  |  | $ | 937,771 |
Goodwill resulting from business combinations |  | 758 |  |  | 62,978 |  |  | 0 |
Balance at end of year |  | $ | 1,001,507 |  |  | $ | 1,000,749 |  |  | $ | 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, 2022 |  | December 31, 2021
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (26,488) |  |  | $ | 45,256 |  |  | $ | (26,911) |
Customer list |  | 69,563 |  |  | (14,457) |  |  | 69,563 |  |  | (8,362) |
Other |  | 14,079 |  |  | (7,064) |  |  | 14,589 |  |  | (5,237) |
Unamortized intangible assets |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 16,536 |  | 0 |  | 15,469 |  | 0
Total |  | $ | 141,928 |  |  | $ | (48,009) |  |  | $ | 144,877 |  |  | $ | (40,510) |
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
2023 |  | $ | 10,538 |
2024 |  | 9,195 |
2025 |  | 9,147 |
2026 |  | 9,094 |
2027 |  | 9,053 |

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