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Goodwill and other intangibles (Tables) | 9 Months Ended
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Sep. 30, 2025
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 nine-month periods ended September 30, 2025 and 2024.
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
July 1, 2024 |  | $ | 159,595 |  |  | $ | 4,012 |  |  | $ | 163,607 |
Amortization |  | — |  |  | 287 |  |  | 287 |
September 30, 2024 |  | $ | 159,595 |  |  | $ | 3,725 |  |  | $ | 163,320 |
July 1, 2025 |  | $ | 159,595 |  |  | $ | 2,890 |  |  | $ | 162,485 |
Amortization |  | — |  |  | 248 |  |  | 248 |
September 30, 2025 |  | $ | 159,595 |  |  | $ | 2,642 |  |  | $ | 162,237 |
(in thousands) |  | Goodwill |  | Other intangible assets |  | Total
December 31, 2023 |  | $ | 159,595 |  |  | $ | 4,652 |  |  | $ | 164,247 |
Amortization |  | — |  |  | 927 |  |  | 927 |
September 30, 2024 |  | $ | 159,595 |  |  | $ | 3,725 |  |  | $ | 163,320 |
December 31, 2024 |  | $ | 159,595 |  |  | $ | 3,437 |  |  | $ | 163,032 |
Amortization |  | — |  |  | 795 |  |  | 795 |
September 30, 2025 |  | $ | 159,595 |  |  | $ | 2,642 |  |  | $ | 162,237 |
Intangible Assets Disclosure [Text Block] | The following table shows the balance of acquired intangible assets at September 30, 2025 and at December 31, 2024:
|  | September 30, 2025 |  | December 31, 2024
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Other intangible assets: |  |  |  |  |  |  |  |
Core deposit intangible assets |  | $ | 14,456 |  |  | $ | 11,814 |  |  | $ | 14,456 |  |  | $ | 11,019 |
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 2025 and the next four years follows:
(in thousands) |  | Total
Three months ending December 31, 2025 |  | $ | 247 |
2026 |  | 887 |
2027 |  | 754 |
2028 |  | 618 |
2029 |  | 136 |

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