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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Other Intangible Assets |
Summary of changes in the carrying amounts of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2023 | ​ | 2022 |
Balance at beginning of period |  | $ | 1,923,106 |  | $ | 1,581,085 | ​
Additions: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Goodwill from Atlantic Capital acquisition | ​ |  | — | ​ | ​ | 342,021 | ​
Balance at end of period | ​ | $ | 1,923,106 | ​ | $ | 1,923,106 | ​
Summary of gross carrying amounts and accumulated amortization of other intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
(Dollars in thousands) |  | 2023 |  | 2022 |
Gross carrying amount | ​ | $ | 274,753 | ​ | $ | 274,869 | ​
Accumulated amortization | ​ |  | (185,977) | ​ |  | (158,419) | ​
​ | ​ | $ | 88,776 | ​ | $ | 116,450 | ​
Schedule of estimated amortization expense of intangibles assets | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Year ended December 31: |  | ​ |  |
2024 | ​ | $ | 22,395 | ​
2025 | ​ |  | 18,766 | ​
2026 | ​ |  | 15,232 | ​
2027 | ​ |  | 11,756 | ​
2028 | ​ | ​ | 8,020 | ​
Thereafter | ​ |  | 6,655 | ​
​ | ​ | $ | 82,824 | ​
​

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