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Note 3 - Investment Securities Available for Sale (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
Available-for-Sale |  | September 30, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 258,397 |  |  |  | 2,216 |  |  |  | (9,748 | ) |  |  | 250,865 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 147,614 |  |  |  | 1,253 |  |  |  | (9,929 | ) |  |  | 138,938 |
Obligations of states and political subdivisions |  |  | 102,086 |  |  |  | 686 |  |  |  | (7,889 | ) |  |  | 94,883 |
|  | $ | 508,097 |  |  | $ | 4,155 |  |  | $ | (27,566 | ) |  | $ | 484,686 |
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] |
September 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 |  | $ | 5,916 |  |  | $ | 22 |  |  | $ | 92,489 |  |  | $ | 9,726 |  |  | $ | 98,405 |  |  | $ | 9,748 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 8,193 |  |  |  | 36 |  |  |  | 64,400 |  |  |  | 9,893 |  |  |  | 72,593 |  |  |  | 9,929 |
Obligations of states and political subdivisions |  |  | 14,340 |  |  |  | 199 |  |  |  | 47,875 |  |  |  | 7,690 |  |  |  | 62,215 |  |  |  | 7,889 |
|  | $ | 28,449 |  |  | $ | 257 |  |  | $ | 204,764 |  |  | $ | 27,309 |  |  | $ | 233,213 |  |  | $ | 27,566 |
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 |  |  | $ | 734 |
After one year through five years |  |  | 6,575 |  |  |  | 6,655 |
After five years through ten years |  |  | 19,025 |  |  |  | 19,069 |
After ten years |  |  | 75,751 |  |  |  | 68,425 |
Investment securities not due at a single maturity date: |  |  |  |  |  |  |  |
U.S. Government-sponsored agencies collateralized by mortgage obligations - residential |  |  | 258,397 |  |  |  | 250,865 |
U.S. Government- sponsored agencies collateralized by mortgage obligations - commercial |  |  | 147,614 |  |  |  | 138,938 |
|  | $ | 508,097 |  |  | $ | 484,686 |

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