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GOODWILL (Tables) | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the three and nine months ended September 30, 2024 and September 30, 2023 were as follows:
|  | Three months ended |  | Nine months ended
|  | September 30, |  | September 30,
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Balance at beginning of period |  | $ | 1,007,656 |  |  | $ | 1,005,828 |  |  | $ | 1,005,868 |  |  | $ | 1,001,507 |
Goodwill resulting from business combinations |  | 0 |  |  | 40 |  |  | 1,788 |  |  | 4,361 |
Balance at end of period |  | $ | 1,007,656 |  |  | $ | 1,005,868 |  |  | $ | 1,007,656 |  |  | $ | 1,005,868 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | September 30, 2024 |  | December 31, 2023
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (31,575) |  |  | $ | 41,750 |  |  | $ | (29,395) |
Customer list |  | 72,278 |  |  | (25,246) |  |  | 69,563 |  |  | (20,553) |
Other |  | 9,381 |  |  | (3,284) |  |  | 10,960 |  |  | (5,477) |
Mortgage servicing rights |  | 26,508 |  |  | (8,265) |  |  | 23,791 |  |  | (6,690) |
Total |  | $ | 149,917 |  |  | $ | (68,370) |  |  | $ | 146,064 |  |  | $ | (62,115) |

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