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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The change in goodwill during the years ended December 31, 2017, 2016, and 2015 is as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Balance, beginning of year | $ | 40,231 |  |  | $ | 29,917 |  |  | $ | 29,917 |
Acquired goodwill | 13,546 |  |  | 10,314 |  |  | — |
Impairment | — |  |  | — |  |  | — |
Balance, end of year | $ | 53,777 |  |  | $ | 40,231 |  |  | $ | 29,917 |
Schedule of Expected Amortization Expense | The following table summarizes the Company’s estimated core deposit intangible amortization expense for each of the next five years (in thousands):
Years Ending December 31, |  | Estimated Core Deposit Intangible Amortization
2018 |  | $ | 376 |
2019 |  | 376 |
2020 |  | 376 |
2021 |  | 376 |
2022 |  | 376 |
Thereafter |  | 1,147 |
Total |  | $ | 3,027 |

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