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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023, 2022 and 2021 are shown below.
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021
Balance at beginning of year |  | $ | 1,001,507 |  |  | $ | 1,000,749 |  |  | $ | 937,771 |
Goodwill resulting from business combinations |  | 4,361 |  |  | 758 |  |  | 62,978 |
Balance at end of year |  | $ | 1,005,868 |  |  | $ | 1,001,507 |  |  | $ | 1,000,749 |
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, 2023 |  | December 31, 2022
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (29,395) |  |  | $ | 41,750 |  |  | $ | (26,488) |
Customer list |  | 69,563 |  |  | (20,553) |  |  | 69,563 |  |  | (14,457) |
Other |  | 10,960 |  |  | (5,477) |  |  | 14,079 |  |  | (7,064) |
Mortgage servicing rights |  | 23,791 |  | (6,690) |  | 21,347 |  | (4,811)
Total |  | $ | 146,064 |  |  | $ | (62,115) |  |  | $ | 146,739 |  |  | $ | (52,820) |
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
2024 |  | $ | 9,193 |
2025 |  | 9,145 |
2026 |  | 9,092 |
2027 |  | 9,051 |
2028 |  | 6,842 |

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