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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
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, |
|  | 2019 |  |  | 2018 |
|  | (Dollars in thousands) |
Balance, beginning of period |  | $ | 666,539 |  |  | $ | 116,564 |
Addition due to acqusition |  |  | - |  |  |  | 549,975 |
Measurement period adjustments |  |  | (2,832 | ) |  |  | - |
Balance, end of period |  | $ | 663,707 |  |  | $ | 666,539 |
Summary of Amortizable Intangible Assets | The following summarizes changes in CDI and the related accumulated amortization for the periods presented.
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |
|  | Gross CDI Amount |  |  | Accumulated Amortization |  |  | Net CDI Amount |  |  | Gross CDI Amount |  |  | Accumulated Amortization |  |  | Net CDI Amount |
|  | (Dollars in thousands) |
Balance of intangible assets, beginning of period |  | $ | 93,297 |  |  | $ | (39,513 | ) |  | $ | 53,784 |  |  | $ | 41,097 |  |  | $ | (34,259 | ) |  | $ | 6,838 |
Addition due to acquisition s |  |  | - |  |  |  |  |  |  |  |  |  |  |  | 52,200 |  |  |  |  |  |  |  |  |
Balance of intangible assets, end of period |  | $ | 93,297 |  |  | $ | (50,311 | ) |  | $ | 42,986 |  |  | $ | 93,297 |  |  | $ | (39,513 | ) |  | $ | 53,784 |
Aggregate amortization expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For year ended December 31, |  | $ | 10,798 |  |  |  |  |  |  |  |  |  |  | $ | 5,254 |  |  |  |  |  |  |  |  |
Estimated Amortization Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2020 |  | $ | 9,352 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2021 |  |  | 8,240 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2022 |  |  | 7,126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2023 |  |  | 6,010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  | 12,258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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