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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 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:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (in thousands)
Total goodwill, end of period |  | $ | 765,842 |  |  | $ | 765,842 |  |  | $ | 765,842 |
Other intangible assets, net |  |  |  |  |  |
CDI: |  |  |  |  |  |
Gross CDI balance, beginning of period |  | 105,473 |  |  | 105,473 |  |  | 105,473 |
Accumulated amortization, beginning of period |  | (70,934) |  |  | (60,455) |  |  | (48,219) |
CDI, net, beginning of period |  | 34,539 |  |  | 45,018 |  |  | 57,254 |
CDI current period amortization |  | (8,724) |  |  | (10,479) |  |  | (12,236) |
Total CDI, end of period |  | 25,815 |  |  | 34,539 |  |  | 45,018 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 26,734 |  |  | 35,458 |  |  | 45,937 |
Total goodwill and intangible assets, end of period |  | $ | 792,576 |  |  | $ | 801,300 |  |  | $ | 811,779 |
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of CDI for the succeeding five years:
|  | Years Ending December 31,
|  | (in thousands)
2021 |  | $ | 7,264 |
2022 |  | 5,880 |
2023 |  | 4,552 |
2024 |  | 3,432 |
2025 |  | 2,415 |

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