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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024, 2023 and 2022 are shown below.
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2022
Balance at beginning of year |  | $ | 1,005,868 |  |  | $ | 1,001,507 |  |  | $ | 1,000,749 |
Goodwill resulting from business combinations |  | 1,788 |  |  | 4,361 |  |  | 758 |
Balance at end of year |  | $ | 1,007,656 |  |  | $ | 1,005,868 |  |  | $ | 1,001,507 |
Schedule of Finite-Lived Intangible Assets | The gross carrying amount and accumulated amortization of other intangible assets were as follows:
|  | December 31, 2024 |  | December 31, 2023
(Dollars in thousands) |  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (32,302) |  |  | $ | 41,750 |  |  | $ | (29,395) |
Customer list |  | 72,278 |  |  | (26,822) |  |  | 69,563 |  |  | (20,553) |
Other |  | 9,381 |  |  | (3,416) |  |  | 10,960 |  |  | (5,477) |
Mortgage servicing rights |  | 27,217 |  | (8,795) |  | 23,791 |  | (6,690)
Total |  | $ | 150,626 |  |  | $ | (71,335) |  |  | $ | 146,064 |  |  | $ | (62,115) |
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
2025 |  | $ | 9,562 |
2026 |  | 9,330 |
2027 |  | 9,260 |
2028 |  | 7,051 |
2029 |  | 6,304 |

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