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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
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,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Total goodwill |  | $ | 765,842 |  |  | $ | 765,842 |  |  | $ | 765,842 |  |  | $ | 765,842 |
Other intangible assets, net |  |  |  |  |  |  |  |
CDI: |  |  |  |  |  |  |  |
Gross CDI balance at beginning of period |  | 105,473 |  |  | 105,473 |  |  | 105,473 |  |  | 105,473 |
Accumulated amortization at beginning of period |  | (75,454) |  |  | (65,852) |  |  | (70,934) |  |  | (60,455) |
CDI, net at beginning of period |  | 30,019 |  |  | 39,621 |  |  | 34,539 |  |  | 45,018 |
CDI current period amortization |  | (2,193) |  |  | (2,632) |  |  | (6,713) |  |  | (8,029) |
Total CDI, net at end of period |  | 27,826 |  |  | 36,989 |  |  | 27,826 |  |  | 36,989 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 28,745 |  |  | 37,908 |  |  | 28,745 |  |  | 37,908 |
Total goodwill and other intangible assets at end of period |  | $ | 794,587 |  |  | $ | 803,750 |  |  | $ | 794,587 |  |  | $ | 803,750 |
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of our CDI for the remaining three months ending December 31, 2020 and the succeeding four years:
|  | Year ending December 31,
|  | (in thousands)
2020 |  | $ | 2,012 |
2021 |  | 7,264 |
2022 |  | 5,880 |
2023 |  | 4,552 |
2024 |  | 3,432 |

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