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Note 6 - Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | 2022 |  |  | 2021 |
|  | (dollars in thousands) |
Balance, January 1 |  | $ | 208,372 |  |  | $ | 208,372 |
Acquired goodwill |  |  | - |  |  |  | - |
Impairment |  |  | - |  |  |  | - |
Balance, December 31 |  | $ | 208,372 |  |  | $ | 208,372 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | Gross |  |  |  |  |  |  | Net |
|  | Carrying |  |  | Accumulated |  |  | Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |
|  | (dollars in thousands) |
Core deposit intangibles |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2022 |  | $ | 18,515 |  |  | $ | (11,203 | ) |  | $ | 7,312 |
Core deposit intangibles |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2021 |  | $ | 18,515 |  |  | $ | (9,518 | ) |  | $ | 8,997 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2023 |  | $ | 1,438 |
2024 |  |  | 1,235 |
2025 |  |  | 1,116 |
2026 |  |  | 1,050 |
2027 |  |  | 989 |

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