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v3.26.1

GOODWILL (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the three months ended March 31, 2026 and March 31, 2025 were as follows:
|  |  |  | Three months ended
|  |  |  | March 31,
(Dollars in thousands) |  |  |  |  |  | 2026 |  | 2025
Balance at beginning of period |  |  |  |  |  | $ | 1,099,524 |  |  | $ | 1,007,656 |
Goodwill resulting from business combinations |  |  |  |  |  | 19 |  |  | 0 |
Balance at end of period |  |  |  |  |  | $ | 1,099,543 |  |  | $ | 1,007,656 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | March 31, 2026 |  | December 31, 2025
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Core deposit intangibles |  | $ | 121,806 |  |  | $ | (41,428) |  |  | $ | 88,814 |  |  | $ | (36,777) |
Customer lists |  | 72,278 |  |  | (34,703) |  |  | 72,278 |  |  | (33,127) |
Other |  | 9,269 |  |  | (3,711) |  |  | 9,269 |  |  | (3,654) |
Mortgage servicing rights |  | 34,241 |  |  | (11,825) |  |  | 33,013 |  |  | (10,984) |
Total |  | $ | 237,594 |  |  | $ | (91,667) |  |  | $ | 203,374 |  |  | $ | (84,542) |

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