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Goodwill and other intangibles Goodwill and other intangibles (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | 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 |
Intangible Assets Disclosure [Text Block] | 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 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | 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 Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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