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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 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:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Total goodwill (1) |  | $ | 765,842 |  |  | $ | 382,762 |  |  | $ | 765,842 |  |  | $ | 382,762 |
Other intangible assets, net |  |  |  |  |  |  |  |
Core deposit intangible: |  |  |  |  |  |  |  |
Gross core deposit intangible balance at beginning of period |  | 105,473 |  |  | 58,598 |  |  | 105,473 |  |  | 58,598 |
Accumulated amortization at beginning of period |  | (54,495 | ) |  | (44,484 | ) |  | (48,219 | ) |  | (41,886 | )
Core deposit intangible, net at beginning of period |  | 50,978 |  |  | 14,114 |  |  | 57,254 |  |  | 16,712 |
CDI current period amortization |  | (3,070 | ) |  | (1,188 | ) |  | (9,346 | ) |  | (3,786 | )
Total core deposit intangible, net at end of period |  | 47,908 |  |  | 12,926 |  |  | 47,908 |  |  | 12,926 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 48,827 |  |  | 13,845 |  |  | 48,827 |  |  | 13,845 |
Total goodwill and other intangible assets at end of period |  | $ | 814,669 |  |  | $ | 396,607 |  |  | $ | 814,669 |  |  | $ | 396,607 |
__________ (1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded 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 remaining three months ending December 31, 2018 and the succeeding four years:
|  | Amount
|  | (in thousands)
Year ending December 31, |  |
2018 |  | $ | 2,890 |
2019 |  | 10,479 |
2020 |  | 8,724 |
2021 |  | 7,264 |
2022 |  | 5,880 |

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