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Intangible Assets | 3 Months Ended
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Mar. 31, 2020
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:
|  | March 31, 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 |  | $ | 157,150 |  |  | $ | (51,966 | ) |  | $ | 105,184 |  |  | $ | 157,150 |  |  | $ | (47,372 | ) |  | $ | 109,778 |
Customer relationships (a) |  | 23,000 |  |  | (5,734 | ) |  | 17,266 |  |  | 77,865 |  |  | (60,150 | ) |  | 17,715 |
Other (b) |  | 5,622 |  |  | (3,180 | ) |  | 2,442 |  |  | 5,622 |  |  | (2,915 | ) |  | 2,707 |
Total |  | $ | 185,772 |  |  | $ | (60,880 | ) |  | $ | 124,892 |  |  | $ | 240,637 |  |  | $ | (110,437 | ) |  | $ | 130,200 |
(a) | 2020 decrease in gross carrying amounts and accumulated amortization associated with $54.9 million of customer relationships fully amortized at December 31, 2019.
(b) | Balance primarily includes noncompete covenants, as well as $.3 million related to state banking licenses not subject to amortization.
Amortization expense was $5.3 million and $6.2 million for the three months ended March 31, 2020 and 2019, respectively. As of March 31, 2020 the estimated aggregated amortization expense is expected to be:
(Dollars in thousands) |  |
Year |  | Amortization
Remainder of 2020 |  | $ | 15,852 |
2021 |  | 19,547 |
2022 |  | 17,412 |
2023 |  | 16,117 |
2024 |  | 14,679 |
2025 |  | 12,580 |
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 March 31, 2020 and December 31, 2019. 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 March 31, 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 |  | — |  |  | — |  |  | — |
March 31, 2019 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
December 31, 2019 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |
Additions |  | — |  |  | — |  |  | — |
March 31, 2020 |  | $ | 1,289,819 |  |  | $ | 142,968 |  |  | $ | 1,432,787 |

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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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