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Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The following is a summary of other intangible assets included in the Consolidated Condensed Statements of Condition:
|  | June 30, 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 |  |  | $ | (37,761 | ) |  | $ | 119,389 |  |  | $ | 157,150 |  |  | $ | (28,150 | ) |  | $ | 129,000 |
Customer relationships |  | 77,865 |  |  | (57,879 | ) |  | 19,986 |  |  | 77,865 |  |  | (55,597 | ) |  | 22,268 |
Other (a) |  | 5,622 |  |  | (2,385 | ) |  | 3,237 |  |  | 5,622 |  |  | (1,856 | ) |  | 3,766 |
Total |  | $ | 240,637 |  |  | $ | (98,025 | ) |  | $ | 142,612 |  |  | $ | 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.
Amortization expense was $6.2 million and $6.5 million for the three months ended June 30, 2019 and 2018, respectively and $12.4 million and $12.9 million for six months ended June 30, 2019 and 2018, respectively. As of June 30, 2019 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
Remainder of 2019 |  | $ | 12,419 |
2020 |  | 21,159 |
2021 |  | 19,547 |
2022 |  | 17,412 |
2023 |  | 16,117 |
2024 |  | 14,679 |
Gross goodwill, accumulated impairments, and accumulated divestiture related write-offs were determined beginning January 1, 2002, 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 June 30, 2019 and December 31, 2018. 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 Condensed Statements of Condition as of June 30, 2019 and December 31, 2018.
(Dollars in thousands) |  | Regional Banking |  | Fixed Income |  | Total
December 31, 2017 |  | $ | 1,243,885 |  |  | $ | 142,968 |  |  | $ | 1,386,853 |
Additions (a) |  | 22,423 |  |  | — |  |  | 22,423 |
June 30, 2018 |  | $ | 1,266,308 |  |  | $ | 142,968 |  |  | $ | 1,409,276 |
December 31, 2018 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
Additions |  | — |  |  | — |  |  | — |
June 30, 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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