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Note 3 - Investment Securities Available for Sale (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
Available-for-Sale |  | June 30, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 232,554 |  |  |  | 1,187 |  |  |  | (11,217 | ) |  |  | 222,524 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 138,530 |  |  |  | 930 |  |  |  | (10,219 | ) |  |  | 129,241 |
Obligations of states and political subdivisions |  |  | 97,947 |  |  |  | 299 |  |  |  | (10,335 | ) |  |  | 87,911 |
|  | $ | 469,031 |  |  | $ | 2,416 |  |  | $ | (31,771 | ) |  | $ | 439,676 |
Available-for-Sale |  | December 31, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 243,709 |  |  |  | 138 |  |  |  | (15,456 | ) |  |  | 228,391 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 133,749 |  |  |  | 77 |  |  |  | (11,956 | ) |  |  | 121,870 |
Obligations of states and political subdivisions |  |  | 95,975 |  |  |  | 315 |  |  |  | (8,816 | ) |  |  | 87,474 |
|  | $ | 473,433 |  |  | $ | 530 |  |  | $ | (36,228 | ) |  | $ | 437,735 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
June 30, 2025 |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  | $ | 37,229 |  |  | $ | 413 |  |  | $ | 90,718 |  |  | $ | 10,804 |  |  | $ | 127,947 |  |  | $ | 11,217 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 8,265 |  |  |  | 54 |  |  |  | 66,204 |  |  |  | 10,165 |  |  |  | 74,469 |  |  |  | 10,219 |
Obligations of states and political subdivisions |  |  | 23,086 |  |  |  | 667 |  |  |  | 47,881 |  |  |  | 9,668 |  |  |  | 70,967 |  |  |  | 10,335 |
|  | $ | 68,580 |  |  | $ | 1,134 |  |  | $ | 204,803 |  |  | $ | 30,637 |  |  | $ | 273,383 |  |  | $ | 31,771 |
December 31, 2024 |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 107,328 |  |  |  | 1,917 |  |  |  | 94,506 |  |  |  | 13,539 |  |  |  | 201,834 |  |  |  | 15,456 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 55,921 |  |  |  | 926 |  |  |  | 57,735 |  |  |  | 11,030 |  |  |  | 113,656 |  |  |  | 11,956 |
Obligations of states and political subdivisions |  |  | 18,938 |  |  |  | 250 |  |  |  | 48,460 |  |  |  | 8,566 |  |  |  | 67,398 |  |  |  | 8,816 |
|  | $ | 182,187 |  |  | $ | 3,093 |  |  | $ | 200,701 |  |  | $ | 33,135 |  |  | $ | 382,888 |  |  | $ | 36,228 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized Cost |  |  | Estimated Fair Value |
Within one year |  | $ | 735 |  |  | $ | 733 |
After one year through five years |  |  | 6,072 |  |  |  | 6,087 |
After five years through ten years |  |  | 19,749 |  |  |  | 19,500 |
After ten years |  |  | 71,391 |  |  |  | 61,591 |
Investment securities not due at a single maturity date: |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 232,554 |  |  |  | 222,524 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 138,530 |  |  |  | 129,241 |
|  | $ | 469,031 |  |  | $ | 439,676 |

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