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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The change in goodwill during the year is as follows:
|  | 2020 |  |  | 2019 |
|  | (dollars in thousands) |
Balance, January 1 |  | $ | 162,574 |  |  | $ | 145,909 |
Acquired goodwill |  |  | 45,798 |  |  |  | 16,665 |
Impairment |  |  | - |  |  |  | - |
Balance, December 31 |  | $ | 208,372 |  |  | $ | 162,574 |
Intangible Assets Disclosure [Text Block] | The table below provides information regarding the carrying amounts and accumulated amortization of total amortized intangible assets as of the dates set forth below.
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
|  | (dollars in thousands) |
As of December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 18,515 |  |  | $ | (7,538) |  |  | $ | 10,977 |
As of December 31, 2019 |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 10,439 |  |  | $ | (4,979) |  |  | $ | 5,460 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Aggregate amortization expense was approximately $2.6 million, $1.4 million and $0.6 million for 2020, 2019 and 2018, respectively. Estimated amortization expense for each of the next five years (dollars in thousands):
2021 |  | $ | 1,981 |
2022 |  |  | 1,485 |
2023 |  |  | 1,438 |
2024 |  |  | 1,235 |
2025 |  |  | 1,116 |

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