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Goodwill and other intangibles Goodwill and other intangibles | 9 Months Ended
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Sep. 30, 2018
Goodwill [Line Items] |
Goodwill and Intangible Assets Disclosure [Text Block] | Goodwill and Other Intangibles The following table shows the activity in goodwill and other intangibles for the first nine months of 2018.
(in thousands) |  | Goodwill |  | Other Intangibles |  | Total
December 31, 2017 |  | $ | 72,334 |  |  | $ | — |  |  | $ | 72,334 |
Acquired goodwill and other intangibles |  | 40,405 |  |  | 7,549 |  |  | 47,954 |
Amortization |  | — |  |  | 289 |  |  | 289 |
September 30, 2018 |  | $ | 112,739 |  |  | $ | 7,260 |  |  | $ | 119,999 |
Park evaluates goodwill for impairment on April 1 of each year, with financial data as of March 31. Based on the analysis performed as of April 1, 2018, the Company determined that goodwill for Park's national bank subsidiary (PNB) was not impaired. There have been no subsequent circumstances or events triggering an additional evaluation. Acquired Intangible Assets The following table shows the balance of acquired intangible assets as of September 30, 2018. Park had no other intangible assets as of December 31, 2017.
|  | 2018
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |
Core deposit intangibles |  | $ | 6,249 |  |  | $ | 289 |
Trade name intangible |  | 1,300 |  |  | — |
Total |  | $ | 7,549 |  |  | $ | 289 |
Core deposit intangibles are being amortized, on an accelerated basis, over a period of ten years. The trade name intangible is an indefinite life asset and is not amortized, but rather is assessed, at least annually, for impairment. Aggregate amortization expense was $289,000 for both the three months and nine months ended September 30, 2018. There was no amortization expense during 2017. Estimated amortization expense for each of the periods listed below follows:
(in thousands) |  | Total
Three months ending December 31, 2018 |  | $ | 289 |
2019 |  | 1,234 |
2020 |  | 1,149 |
2021 |  | 869 |
2022 |  | 629 |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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