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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill for the periods presented.
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |
|  | (Dollars in thousands) |
Balance, beginning of period |  | $ | 765,822 |  |  | $ | 663,707 |
Additions due to acquisitions |  |  | — |  |  |  | 102,115 |
Balance, end of period |  | $ | 765,822 |  |  | $ | 765,822 |
Summary of Amortizable Intangible Assets | The following summarizes changes in CDI and the related accumulated amortization for the periods presented.
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |
|  | Gross CDI |  |  | Accumulated |  |  | Net CDI |  |  | Gross CDI |  |  | Accumulated |  |  | Net CDI |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
|  | (Dollars in thousands) |
Balance of intangible assets, beginning of period |  | $ | 97,211 |  |  | $ | (75,470 | ) |  | $ | 21,742 |  |  | $ | 93,297 |  |  | $ | (67,903 | ) |  | $ | 25,394 |
Additions due to acquisitions |  |  |  |  |  |  |  |  |  |  |  | 3,914 |  |  |  |  |  |  |
Amortization |  |  | — |  |  |  | (6,451 | ) |  |  | (6,451 | ) |  |  | — |  |  |  | (7,567 | ) |  |  | (3,652 | )
Balance of intangible assets, end of period |  | $ | 97,211 |  |  | $ | (81,921 | ) |  | $ | 15,291 |  |  | $ | 97,211 |  |  | $ | (75,470 | ) |  | $ | 21,742 |
The following table reflects the estimated amortization expense for the periods presented, as of December 31, 2023.
|  | December 31, 2023 |
Year: |  | (Dollars in thousands) |
2024 |  | $ | 5,324 |
2025 |  |  | 4,193 |
2026 |  |  | 2,822 |
2027 |  |  | 1,397 |
2028 |  |  | 547 |
Thereafter |  |  | 1,008 |
Total |  | $ | 15,291 |

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