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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
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 Balance Sheets as of September 30, 2020 and December 31, 2019.
(Dollars in thousands) |  | Regional Banking |  | Fixed Income |  | Total
December 31, 2018 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
Additions |  | — |  |  | — |  |  | — |
September 30, 2019 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
December 31, 2019 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
Additions |  | 77,644 |  |  | — |  |  | 77,644 |
September 30, 2020 |  | $ | 1,367,463 |  |  | $ | 142,968 |  |  | $ | 1,510,431 |
Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition | The following table, which excludes fully amortized intangibles, presents other intangible assets included in the Consolidated Balance Sheets:
|  | September 30, 2020 |  | December 31, 2019
(Dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangibles |  | $ | 370,850 |  |  | $ | (68,902) |  |  | $ | 301,948 |  |  | $ | 157,150 |  |  | $ | (47,372) |  |  | $ | 109,778 |
Customer relationships |  | 37,000 |  |  | (7,037) |  |  | 29,963 |  |  | 77,865 |  |  | (60,150) |  |  | 17,715 |
Other (a) |  | 38,685 |  |  | (4,896) |  |  | 33,789 |  |  | 5,622 |  |  | (2,915) |  |  | 2,707 |
Total |  | $ | 446,535 |  |  | $ | (80,835) |  |  | $ | 365,700 |  |  | $ | 240,637 |  |  | $ | (110,437) |  |  | $ | 130,200 |
(a)Includes noncompete covenants, purchased credit card intangible assets, and state banking licenses not subject to amortization.
Schedule of Estimated Aggregate Amortization Expense for Intangible Assets | As of September 30, 2020 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
Remainder of 2020 |  | $ | 14,921 |
2021 |  | 55,943 |
2022 |  | 51,498 |
2023 |  | 47,859 |
2024 |  | 44,040 |
2025 |  | 37,145 |

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