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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | Note 9—Goodwill and Other Intangible Assets The Company evaluated the carrying value of goodwill as of April 30, 2020, its annual test date, and obtained a third-party valuation during the fourth quarter of 2020 and concluded that no impairment charge was necessary. The Company will continue to monitor the impact of COVID-19 on the Company’ business, operating results, cash flows and/or financial condition. The following is a 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 | ​
​ The Company’s other intangible assets, consisting of core deposit intangibles, noncompete intangibles, and client list intangibles are included on the face of the balance sheet. The following is a 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 | ​
​ Amortization expense totaled $27.0 million and $13.1 million and $14.2 million for the years ended December 31, 2020, 2019, and 2018, respectively. Other intangibles are amortized using either the straight-line method or an accelerated basis over their estimated useful lives, with lives generally between 2 and 15 years. Estimated amortization expense for other intangibles for each of the next five years is as follows: ​
​ | ​ | ​ | ​ | ​
(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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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