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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets |
Summary of changes in the carrying amounts of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2020 | ​ | 2019 |
Balance at beginning of period |  | $ | 1,002,900 |  | $ | 1,002,900 | ​
Additions: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Goodwill from CenterState acquisition | ​ |  | 561,042 | ​ | ​ | — | ​
Balance at end of period | ​ | $ | 1,563,942 | ​ | $ | 1,002,900 | ​
Summary of gross carrying amounts and accumulated amortization of other intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, |
(Dollars in thousands) |  | ​ | 2020 | ​ | 2019 |
Gross carrying amount | ​ |  | $ | 258,554 |  | $ | 119,501 | ​
Accumulated amortization | ​ | ​ |  | (95,962) | ​ |  | (69,685) | ​
​ | ​ | ​ | $ | 162,592 | ​ | $ | 49,816 | ​
Schedule of estimated amortization expense of intangibles assets | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Year ended December 31: |  | ​ |  | ​
2021 | ​ | $ | 33,845 | ​
2022 | ​ |  | 30,056 | ​
2023 | ​ |  | 24,634 | ​
2024 | ​ |  | 19,790 | ​
2025 | ​ |  | 16,480 | ​
Thereafter | ​ |  | 37,787 | ​
​ | ​ | $ | 162,592 | ​
​ | ​ | ​ | ​ | ​

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