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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Total goodwill |  | $ | 823,172 |  |  | $ | 765,842 |  |  | $ | 823,172 |  |  | $ | 765,842 |
Other intangible assets, net |  |  |  |  |  |  |  |
CDI: |  |  |  |  |  |  |  |
Gross CDI balance at beginning of period (1) |  | 88,931 |  |  | 105,473 |  |  | 88,931 |  |  | 105,473 |
Accumulated amortization at beginning of period |  | (59,710) |  |  | (83,434) |  |  | (55,203) |  |  | (79,658) |
CDI, net at beginning of period |  | 29,221 |  |  | 22,039 |  |  | 33,728 |  |  | 25,815 |
CDI current period amortization |  | (2,219) |  |  | (1,835) |  |  | (6,726) |  |  | (5,611) |
Total CDI, net at end of period |  | 27,002 |  |  | 20,204 |  |  | 27,002 |  |  | 20,204 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 27,921 |  |  | 21,123 |  |  | 27,921 |  |  | 21,123 |
Total goodwill and other intangible assets at end of period |  | $ | 851,093 |  |  | $ | 786,965 |  |  | $ | 851,093 |  |  | $ | 786,965 |
__________ (1) For the three and nine months ended September 30, 2022, the gross CDI balance, beginning of period excludes fully amortized amounts. Prior period columns have 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 three months ending December 31, 2022 and the succeeding four years:
|  | Total
|  | (in thousands)
Remainder of 2022 |  | $ | 1,972 |
2023 |  | 7,082 |
2024 |  | 5,673 |
2025 |  | 4,366 |
2026 |  | 3,225 |

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