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Goodwill and other intangibles (Tables) | 9 Months Ended
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Sep. 30, 2019
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 intangible assets for the nine months ended September 30, 2019 and 2018.
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
December 31, 2017 |  | $ | 72,334 |  |  | $ | — |  |  | $ | 72,334 |
Acquired goodwill and other intangible assets |  | 40,405 |  |  | 7,549 |  |  | 47,954 |
Amortization |  | — |  |  | 289 |  |  | 289 |
September 30, 2018 |  | $ | 112,739 |  |  | $ | 7,260 |  |  | $ | 119,999 |
December 31, 2018 |  | $ | 112,739 |  |  | $ | 6,971 |  |  | $ | 119,710 |
Acquired goodwill and other intangible assets |  | 45,260 |  |  | 10,251 |  |  | 55,511 |
Amortization |  | — |  |  | 1,732 |  |  | 1,732 |
September 30, 2019 |  | $ | 157,999 |  |  | $ | 15,490 |  |  | $ | 173,489 |
Intangible Assets Disclosure [Text Block] | The following table shows the balance of acquired intangible assets as of September 30, 2019 and December 31, 2018.
|  | September 30, 2019 |  | December 31, 2018
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |  |  |  |  |
Core deposit intangible assets |  | $ | 16,500 |  |  | $ | 2,310 |  |  | $ | 6,249 |  |  | $ | 578 |
Trade name intangible assets |  | 1,300 |  |  | — |  |  | 1,300 |  |  | — |
Total |  | $ | 17,800 |  |  | $ | 2,310 |  |  | $ | 7,549 |  |  | $ | 578 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Estimated amortization expense related to core deposit intangible assets for each of the periods listed below follows:
(in thousands) |  | Total
Three months ending December 31, 2019 |  | $ | 741 |
2020 |  | 2,502 |
2021 |  | 2,040 |
2022 |  | 1,725 |
2023 |  | 1,548 |

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