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Goodwill and other intangibles (Tables) | 3 Months Ended
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Mar. 31, 2021
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 periods ended March 31, 2021 and 2020.
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
December 31, 2019 |  | $ | 159,595 |  |  | $ | 11,523 |  |  | $ | 171,118 |
Amortization |  | — |  |  | 606 |  |  | 606 |
March 31, 2020 |  | $ | 159,595 |  |  | $ | 10,917 |  |  | $ | 170,512 |
December 31, 2020 |  | $ | 159,595 |  |  | $ | 9,260 |  |  | $ | 168,855 |
Amortization |  | — |  |  | 479 |  |  | 479 |
March 31, 2021 |  | $ | 159,595 |  |  | $ | 8,781 |  |  | $ | 168,376 |
Intangible Assets Disclosure [Text Block] | The following table shows the balance of acquired intangible assets as of March 31, 2021 and December 31, 2020.
|  | March 31, 2021 |  | December 31, 2020
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |  |  |  |  |
Core deposit intangible assets |  | $ | 14,456 |  |  | $ | 5,675 |  |  | $ | 14,456 |  |  | $ | 5,196 |
Trade name intangible assets |  | 1,300 |  |  | 1,300 |  |  | 1,300 |  |  | 1,300 |
Total |  | $ | 15,756 |  |  | $ | 6,975 |  |  | $ | 15,756 |  |  | $ | 6,496 |
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
Nine months ending December 31, 2021 |  | $ | 1,319 |
2022 |  | 1,487 |
2023 |  | 1,323 |
2024 |  | 1,215 |
2025 |  | 1,042 |

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