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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | December 31, 2016
(Dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangibles (a) |  | $ | 160,650 |  |  | $ | (8,176 | ) |  | $ | 152,474 |  |  | $ | 16,850 |  |  | $ | (4,721 | ) |  | $ | 12,129 |
Customer relationships (a) |  | 77,865 |  |  | (50,777 | ) |  | 27,088 |  |  | 54,865 |  |  | (46,302 | ) |  | 8,563 |
Other (a) (b) |  | 5,622 |  |  | (795 | ) |  | 4,827 |  |  | 555 |  |  | (230 | ) |  | 325 |
Total |  | $ | 244,137 |  |  | $ | (59,748 | ) |  | $ | 184,389 |  |  | $ | 72,270 |  |  | $ | (51,253 | ) |  | $ | 21,017 |
(a) | 2017 increase primarily associated with the CBF and/or Coastal acquisitions.
(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 December 31, 2017 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
2018 |  | $ | 26,174 |
2019 |  | 25,108 |
2020 |  | 21,422 |
2021 |  | 19,787 |
2022 |  | 17,631 |
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, 2017 ,2016 and 2015.
(Dollars in thousands) |  | Regional Banking |  | Fixed Income |  | Total
December 31, 2014 |  | $ | 47,928 |  |  | $ | 98,004 |  |  | $ | 145,932 |
Additions |  | 45,375 |  |  | — |  |  | 45,375 |
December 31, 2015 |  | $ | 93,303 |  |  | $ | 98,004 |  |  | $ | 191,307 |
Additions |  | 64 |  |  | — |  |  | 64 |
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 |
(a) See Note 2 - Acquisitions and Divestitures for further details regarding goodwill related to acquisitions.

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