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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
|  | 2021 |  | 2020 |  | 2019
|  | (in thousands)
Goodwill, beginning of period |  | $ | 765,842 |  |  | $ | 765,842 |  |  | $ | 765,842 |
Established through acquisition (1) |  | 57,330 |  |  | — |  |  | — |
Total goodwill, end of period |  | 823,172 |  |  | 765,842 |  |  | 765,842 |
Other intangible assets, net |  |  |  |  |  |
CDI: |  |  |  |  |  |
Gross CDI balance, beginning of period (2) |  | 78,821 |  |  | 105,473 |  |  | 105,473 |
Accumulated amortization, beginning of period |  | (53,006) |  |  | (70,934) |  |  | (60,455) |
CDI, net, beginning of period |  | 25,815 |  |  | 34,539 |  |  | 45,018 |
Established through acquisition |  | 15,900 |  |  | — |  |  | — |
CDI current period amortization |  | (7,987) |  |  | (8,724) |  |  | (10,479) |
Total CDI, end of period |  | 33,728 |  |  | 25,815 |  |  | 34,539 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 34,647 |  |  | 26,734 |  |  | 35,458 |
Total goodwill and intangible assets, end of period |  | $ | 857,819 |  |  | $ | 792,576 |  |  | $ | 801,300 |
__________ (1) See Note 2, Business Combinations, for additional information regarding the goodwill related to the acquisition of Bank of Commerce on October 1, 2021. (2) For the year ended December 31, 2021, the gross CDI balance, beginning of period has been adjusted to remove 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 CDI for the succeeding five years:
|  | Years Ending December 31,
|  | (in thousands)
2022 |  | $ | 8,698 |
2023 |  | 7,082 |
2024 |  | 5,673 |
2025 |  | 4,366 |
2026 |  | 3,225 |

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