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Intangible assets Future amortization expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Future intangible asset amortization expense [Abstract] |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated aggregate amortization expense for each of the next five years are as follows:
|  | (Dollars in thousands)
Year |  | Amortization
2019 |  | $ | 1,352 |
2020 |  | 1,492 |
2021 |  | 1,600 |
2022 |  | 1,406 |
2023 |  | 1,292 |
Thereafter |  | 5,970 |
|  | $ | 13,112 |

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- Definition Future intangible asset amortization expense [Abstract] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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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