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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(dollars in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Balance at beginning of period | $ | 1,998,716 |  |  | $ | 1,991,534 |  |  | $ | 1,998,716 |  |  | $ | 1,036,994 |
Acquisitions and adjustments | — |  |  | 11,065 |  |  | — |  |  | 965,605 |
Balance at end of period | $ | 1,998,716 |  |  | $ | 2,002,599 |  |  | $ | 1,998,716 |  |  | $ | 2,002,599 |
Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets | The gross carrying amounts and accumulated amortization of other intangible assets were as follows:
(dollars in thousands) | Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount
September 30, 2023 |  |  |  |  |
Core deposit | $ | 143,511 |  |  | $ | (68,312) |  |  | $ | 75,199 |
Customer trust relationships | 52,621 |  |  | (19,701) |  |  | 32,920 |
Total other intangible assets | $ | 196,132 |  |  | $ | (88,013) |  |  | $ | 108,119 |
December 31, 2022 |  |  |  |  |
Core deposit | $ | 170,642 |  |  | $ | (80,951) |  |  | $ | 89,691 |
Customer trust relationships | 56,243 |  |  | (19,529) |  |  | 36,714 |
Total other intangible assets | $ | 226,885 |  |  | $ | (100,480) |  |  | $ | 126,405 |
Schedule of Estimated Amortization Expense for Future Years | Estimated amortization expense for future years is as follows:
(dollars in thousands) |
2023 remaining | $ | 5,869 |
2024 | 21,239 |
2025 | 18,358 |
2026 | 15,555 |
2027 | 12,867 |
Thereafter | 34,231 |
Total | $ | 108,119 |

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