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Goodwill and other intangibles (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following tables show the activity in goodwill and other intangible assets for the three-month and six-month periods ended June 30, 2020 and 2019.
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
April 1, 2019 |  | $ | 112,739 |  |  | $ | 6,682 |  |  | $ | 119,421 |
Acquired goodwill and other intangible assets |  | 45,318 |  |  | 10,251 |  |  | 55,569 |
Amortization |  | — |  |  | 702 |  |  | 702 |
June 30, 2019 |  | $ | 158,057 |  |  | $ | 16,231 |  |  | $ | 174,288 |
April 1, 2020 |  | $ | 159,595 |  |  | $ | 10,917 |  |  | $ | 170,512 |
Acquired goodwill and other intangible assets |  | — |  |  | — |  |  | — |
Amortization |  | — |  |  | 607 |  |  | 607 |
June 30, 2020 |  | $ | 159,595 |  |  | $ | 10,310 |  |  | $ | 169,905 |
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
December 31, 2018 |  | $ | 112,739 |  |  | $ | 6,971 |  |  | $ | 119,710 |
Acquired goodwill and other intangible assets |  | 45,318 |  |  | 10,251 |  |  | 55,569 |
Amortization |  | — |  |  | 991 |  |  | 991 |
June 30, 2019 |  | $ | 158,057 |  |  | $ | 16,231 |  |  | $ | 174,288 |
December 31, 2019 |  | $ | 159,595 |  |  | $ | 11,523 |  |  | $ | 171,118 |
Acquired goodwill and other intangible assets |  | — |  |  | — |  |  | — |
Amortization |  | — |  |  | 1,213 |  |  | 1,213 |
June 30, 2020 |  | $ | 159,595 |  |  | $ | 10,310 |  |  | $ | 169,905 |
Intangible Assets Disclosure [Text Block] | The following table shows the balance of acquired intangible assets as of June 30, 2020 and December 31, 2019.
|  | June 30, 2020 |  |  |  | December 31, 2019 |  |
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |  |  |  |  |
Core deposit intangible assets |  | $ | 14,456 |  |  | $ | 4,146 |  |  | $ | 14,456 |  |  | $ | 2,933 |
Trade name intangible assets |  | 1,300 |  |  | 1,300 |  |  | 1,300 |  |  | 1,300 |
Total |  | $ | 15,756 |  |  | $ | 5,446 |  |  | $ | 15,756 |  |  | $ | 4,233 |
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 next five years follows:
(in thousands) |  | Total
Six months ending December 31, 2020 |  | $ | 1,050 |
2021 |  | 1,798 |
2022 |  | 1,487 |
2023 |  | 1,323 |
2024 |  | 1,215 |

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