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Goodwill and other intangibles (Tables) | 6 Months Ended
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Jun. 30, 2024
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 three-month and six-month periods ended June 30, 2024 and 2023.
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
April 1, 2023 |  | $ | 159,595 |  |  | $ | 5,648 |  |  | $ | 165,243 |
Amortization |  | — |  |  | 328 |  |  | 328 |
June 30, 2023 |  | $ | 159,595 |  |  | $ | 5,320 |  |  | $ | 164,915 |
April 1, 2024 |  | $ | 159,595 |  |  | $ | 4,332 |  |  | $ | 163,927 |
Amortization |  | — |  |  | 320 |  |  | 320 |
June 30, 2024 |  | $ | 159,595 |  |  | $ | 4,012 |  |  | $ | 163,607 |
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
December 31, 2022 |  | $ | 159,595 |  |  | $ | 5,975 |  |  | $ | 165,570 |
Amortization |  | — |  |  | 655 |  |  | 655 |
June 30, 2023 |  | $ | 159,595 |  |  | $ | 5,320 |  |  | $ | 164,915 |
December 31, 2023 |  | $ | 159,595 |  |  | $ | 4,652 |  |  | $ | 164,247 |
Amortization |  | — |  |  | 640 |  |  | 640 |
June 30, 2024 |  | $ | 159,595 |  |  | $ | 4,012 |  |  | $ | 163,607 |
Intangible Assets Disclosure [Text Block] | The following table shows the balance of acquired intangible assets at June 30, 2024 and at December 31, 2023:
|  | June 30, 2024 |  | December 31, 2023
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |  |  |  |  |
Core deposit intangible assets |  | $ | 14,456 |  |  | $ | 10,444 |  |  | $ | 14,456 |  |  | $ | 9,804 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Estimated amortization expense related to core deposit intangible assets for the remainder of 2024 and the next four years follows:
(in thousands) |  | Total
Six months ending December 31, 2024 |  | $ | 574 |
2025 |  | 1,042 |
2026 |  | 887 |
2027 |  | 754 |
2028 |  | 618 |

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