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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets 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.
Amortization expense was $8.7 million, $5.2 million, and $5.3 million for the years ended December 31, 2017, 2016, and 2015 respectively. 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 |
Gross goodwill, accumulated impairments, and accumulated divestiture related write-offs were determined beginning January 1, 2012, when a change in accounting requirements resulted in goodwill being assessed for impairment rather than being amortized. Gross goodwill of $200.0 million with accumulated impairments and accumulated divestiture-related write-offs of $114.1 million and $85.9 million, respectively, were previously allocated to the non-strategic segment, resulting in $0 net goodwill allocated to the non-strategic segment as of December 31, 2017 and 2016. The regional banking and fixed income segments do not have any accumulated impairments or divestiture related write-offs. 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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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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