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Note 4 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
June 30, 2024 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. government agencies and corporations |  | $ | 353,018 |  |  | $ | - |  |  | $ | 44,205 |  |  | $ | 308,813 |
States and political subdivisions |  |  | 178,435 |  |  |  | - |  |  |  | 32,433 |  |  |  | 146,002 |
Mortgage-backed securities |  |  | 149,839 |  |  |  | 27 |  |  |  | 6,120 |  |  |  | 143,746 |
Corporate debt securities |  |  | 6,506 |  |  |  | - |  |  |  | 849 |  |  |  | 5,657 |
U.S. treasury |  |  | 998 |  |  |  | - |  |  |  | 20 |  |  |  | 978 |
Total securities available for sale |  | $ | 688,796 |  |  | $ | 27 |  |  | $ | 83,627 |  |  | $ | 605,196 |
December 31, 2023 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. government agencies and corporations |  | $ | 353,904 |  |  | $ | - |  |  | $ | 42,060 |  |  | $ | 311,844 |
States and political subdivisions |  |  | 179,507 |  |  |  | - |  |  |  | 29,614 |  |  |  | 149,893 |
Mortgage-backed securities |  |  | 156,875 |  |  |  | - |  |  |  | 6,724 |  |  |  | 150,151 |
Corporate debt securities |  |  | 6,504 |  |  |  | - |  |  |  | 754 |  |  |  | 5,750 |
U.S. treasury |  |  | 996 |  |  |  | - |  |  |  | 33 |  |  |  | 963 |
Total securities available for sale |  | $ | 697,786 |  |  | $ | - |  |  | $ | 79,185 |  |  | $ | 618,601 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2024 |
|  | Amortized Cost |  |  | Fair Value |
Available for Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 20,010 |  |  | $ | 19,618 |
Due after one year through five years |  |  | 187,697 |  |  |  | 172,569 |
Due after five years through ten years |  |  | 268,663 |  |  |  | 227,654 |
Due after ten years |  |  | 212,426 |  |  |  | 185,355 |
Total securities available for sale |  | $ | 688,796 |  |  | $ | 605,196 |
Gain (Loss) on Securities [Table Text Block] |
June 30, 2024 |  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. government agencies and corporations |  | $ | - |  |  | $ | - |  |  | $ | 308,813 |  |  | $ | 44,205 |
State and political subdivisions |  |  | 882 |  |  |  | 120 |  |  |  | 145,120 |  |  |  | 32,313 |
Mortgage-backed securities |  |  | 520 |  |  |  | 1 |  |  |  | 121,951 |  |  |  | 6,119 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 5,657 |  |  |  | 849 |
U.S. treasury |  |  | - |  |  |  | - |  |  |  | 978 |  |  |  | 20 |
Total temporarily impaired securities |  | $ | 1,402 |  |  | $ | 121 |  |  | $ | 582,519 |  |  | $ | 83,506 |
December 31, 2023 |  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. government agencies and corporations |  | $ | - |  |  | $ | - |  |  | $ | 311,844 |  |  | $ | 42,060 |
State and political subdivisions |  |  | 884 |  |  |  | 1 |  |  |  | 148,763 |  |  |  | 29,613 |
Mortgage-backed securities |  |  | 1,616 |  |  |  | 26 |  |  |  | 147,922 |  |  |  | 6,698 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 5,750 |  |  |  | 754 |
U.S. treasury |  |  | - |  |  |  | - |  |  |  | 963 |  |  |  | 33 |
Total temporarily impaired securities |  | $ | 2,500 |  |  | $ | 27 |  |  | $ | 615,242 |  |  | $ | 79,158 |

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