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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
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 Condensed Statements of Condition:
|  | September 30, 2018 |  | December 31, 2017
(Dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangibles (a) |  | $ | 157,150 |  |  | $ | (23,148 | ) |  | $ | 134,002 |  |  | $ | 160,650 |  |  | $ | (8,176 | ) |  | $ | 152,474 |
Customer relationships |  | 77,865 |  |  | (54,404 | ) |  | 23,461 |  |  | 77,865 |  |  | (50,777 | ) |  | 27,088 |
Other (b) |  | 5,622 |  |  | (1,590 | ) |  | 4,032 |  |  | 5,622 |  |  | (795 | ) |  | 4,827 |
Total |  | $ | 240,637 |  |  | $ | (79,142 | ) |  | $ | 161,495 |  |  | $ | 244,137 |  |  | $ | (59,748 | ) |  | $ | 184,389 |
(a) | 2018 decrease in gross carrying amounts associated with the sale of two CBF branches and purchase accounting measurement period adjustments related to the CBF acquisition. See Note 2 - Acquisitions and Divestitures for additional information.
(b) | 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 September 30, 2018 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
Remainder of 2018 |  | $ | 6,471 |
2019 |  | 24,834 |
2020 |  | 21,159 |
2021 |  | 19,547 |
2022 |  | 17,412 |
2023 |  | 16,117 |
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 Condensed Statements of Condition as of September 30, 2018 and December 31, 2017.
(Dollars in thousands) |  | Regional Banking |  | Fixed Income |  | Total
December 31, 2016 |  | $ | 93,367 |  |  | $ | 98,004 |  |  | $ | 191,371 |
Additions (a) |  | — |  |  | 44,964 |  |  | 44,964 |
September 30, 2017 |  | $ | 93,367 |  |  | $ | 142,968 |  |  | $ | 236,335 |
December 31, 2017 |  | $ | 1,243,885 |  |  | $ | 142,968 |  |  | $ | 1,386,853 |
Additions (a) |  | 22,969 |  |  | — |  |  | 22,969 |
September 30, 2018 |  | $ | 1,266,854 |  |  | $ | 142,968 |  |  | $ | 1,409,822 |
(a) 2017 increase associated with the Coastal acquisition, 2018 increase associated with measurement period adjustments for the CBF acquisition. See Note 2 - Acquisitions and Divestitures for additional information.

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