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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Intangible Assets | The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
|  | (in thousands)
Goodwill, beginning of period |  | $ | 765,842 |  |  | $ | 382,762 |  |  | $ | 382,762 |
Established through acquisitions (1) |  | — |  |  | 383,080 |  |  | — |
Total goodwill, end of period |  | 765,842 |  |  | 765,842 |  |  | 382,762 |
Other intangible assets, net |  |  |  |  |  |
Core deposit intangible: |  |  |  |  |  |
Gross core deposit intangible balance, beginning of period |  | 105,473 |  |  | 58,598 |  |  | 58,598 |
Accumulated amortization, beginning of period |  | (48,219 | ) |  | (41,886 | ) |  | (35,940 | )
Core deposit intangible, net, beginning of period |  | 57,254 |  |  | 16,712 |  |  | 22,658 |
Established through acquisition (1) |  | — |  |  | 46,875 |  |  | — |
CDI current period amortization |  | (12,236 | ) |  | (6,333 | ) |  | (5,946 | )
Total core deposit intangible, end of period |  | 45,018 |  |  | 57,254 |  |  | 16,712 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 45,937 |  |  | 58,173 |  |  | 17,631 |
Total goodwill and intangible assets, end of period |  | $ | 811,779 |  |  | $ | 824,015 |  |  | $ | 400,393 |
__________ (1) See Note 2, “Business Combinations,” for additional information regarding the goodwill related to the acquisition of Pacific Continental on November 1, 2017.
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:
|  | Years Ending December 31,
|  | (in thousands)
2019 |  | $ | 10,479 |
2020 |  | 8,724 |
2021 |  | 7,264 |
2022 |  | 5,880 |
2023 |  | 4,552 |

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