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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, |  |
|  | 2022 |  | 2021 |  |  |  |
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Total goodwill |  | $ | 823,172 |  |  | $ | 765,842 |  |  |  |  |
Other intangible assets, net |  |  |  |  |  |  |  |
CDI: |  |  |  |  |  |  |  |
Gross CDI balance at beginning of period (1) |  | 88,931 |  |  | 105,473 |  |  |  |  |
Accumulated amortization at beginning of period |  | (55,203) |  |  | (79,658) |  |  |  |  |
CDI, net at beginning of period |  | 33,728 |  |  | 25,815 |  |  |  |  |
CDI current period amortization |  | (2,288) |  |  | (1,924) |  |  |  |  |
Total CDI, net at end of period |  | 31,440 |  |  | 23,891 |  |  |  |  |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  |  |  |
Other intangible assets, net at end of period |  | 32,359 |  |  | 24,810 |  |  |  |  |
Total goodwill and other intangible assets at end of period |  | $ | 855,531 |  |  | $ | 790,652 |  |  |  |  |
__________ (1) For the three months ended March 31, 2022, the gross CDI balance, beginning of period excludes fully amortized amounts. Prior period column has not been adjusted.
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of our CDI for the remaining nine months ending December 31, 2022 and the succeeding four years:
|  | Year ending December 31,
|  | (in thousands)
2022 |  | $ | 6,410 |
2023 |  | 7,082 |
2024 |  | 5,673 |
2025 |  | 4,366 |
2026 |  | 3,225 |

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