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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition | The following is a summary of other intangible assets included in the Consolidated Statements of Condition:
|  | December 31, 2019 |  | December 31, 2018
(Dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangibles |  | $ | 157,150 |  |  | $ | (47,372 | ) |  | $ | 109,778 |  |  | $ | 157,150 |  |  | $ | (28,150 | ) |  | $ | 129,000 |
Customer relationships |  | 77,865 |  |  | (60,150 | ) |  | 17,715 |  |  | 77,865 |  |  | (55,597 | ) |  | 22,268 |
Other (a) |  | 5,622 |  |  | (2,915 | ) |  | 2,707 |  |  | 5,622 |  |  | (1,856 | ) |  | 3,766 |
Total |  | $ | 240,637 |  |  | $ | (110,437 | ) |  | $ | 130,200 |  |  | $ | 240,637 |  |  | $ | (85,603 | ) |  | $ | 155,034 |
(a) Balance primarily includes noncompete covenants, as well as $.3 million related to state banking licenses not subject to amortization.
Schedule of Estimated Aggregate Amortization Expense for Intangible Assets | As of December 31, 2019 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
2020 |  | $ | 21,159 |
2021 |  | 19,547 |
2022 |  | 17,412 |
2023 |  | 16,117 |
2024 |  | 14,679 |
Summary of Gross Goodwill and Accumulated Impairment Losses and Write-Offs Detailed By Reportable Segments | The following is a summary of goodwill by reportable segment included in the Consolidated Statements of Condition as of December 31, 2019, 2018 and 2017.
(Dollars in thousands) |  | Regional Banking |  | Fixed Income |  | Total
December 31, 2016 |  | $ | 93,367 |  |  | $ | 98,004 |  |  | $ | 191,371 |
Additions (a) |  | 1,150,518 |  |  | 44,964 |  |  | 1,195,482 |
December 31, 2017 |  | $ | 1,243,885 |  |  | $ | 142,968 |  |  | $ | 1,386,853 |
Additions (a) |  | 45,934 |  |  | — |  |  | 45,934 |
December 31, 2018 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
Additions |  | — |  |  | — |  |  | — |
December 31, 2019 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
(a) See Note 2 - Acquisitions and Divestitures for further details regarding goodwill related to acquisitions.

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