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Note 6 - Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
2025: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 165,789 |  |  | $ | 55 |  |  | $ | (6,881 | ) |  | $ | 158,963 |
U.S. government agencies |  |  | 90,704 |  |  |  | 24 |  |  |  | (4,104 | ) |  |  | 86,624 |
U.S. government mortgage-backed securities |  |  | 100,340 |  |  |  | 15 |  |  |  | (11,115 | ) |  |  | 89,240 |
State and political subdivisions |  |  | 262,297 |  |  |  | 57 |  |  |  | (16,793 | ) |  |  | 245,561 |
Corporate bonds |  |  | 63,810 |  |  |  | 19 |  |  |  | (3,801 | ) |  |  | 60,028 |
|  | $ | 682,940 |  |  | $ | 170 |  |  | $ | (42,694 | ) |  | $ | 640,416 |
2024: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 176,483 |  |  | $ | 8 |  |  | $ | (8,776 | ) |  | $ | 167,715 |
U.S. government agencies |  |  | 88,625 |  |  |  | 2 |  |  |  | (5,194 | ) |  |  | 83,433 |
U.S. government mortgage-backed securities |  |  | 103,964 |  |  |  | 6 |  |  |  | (12,920 | ) |  |  | 91,050 |
State and political subdivisions |  |  | 266,118 |  |  |  | 35 |  |  |  | (20,591 | ) |  |  | 245,562 |
Corporate bonds |  |  | 65,338 |  |  |  | 7 |  |  |  | (4,592 | ) |  |  | 60,753 |
|  | $ | 700,528 |  |  | $ | 58 |  |  | $ | (52,073 | ) |  | $ | 648,513 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 101,088 |  |  | $ | 99,775 |
Due after one year through five years |  |  | 374,921 |  |  |  | 355,282 |
Due after five years through ten years |  |  | 98,491 |  |  |  | 88,747 |
Due after ten years |  |  | 8,100 |  |  |  | 7,372 |
|  | $ | 582,600 |  |  | $ | 551,176 |
U.S. government mortgage-backed securities |  |  | 100,340 |  |  |  | 89,240 |
Total |  | $ | 682,940 |  |  | $ | 640,416 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | 2,049 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | - |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | (165 | )
Gain (Loss) on Securities [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |
2025: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 3,903 |  |  | $ | (3 | ) |  |  | 3 |  |  | $ | 143,722 |  |  | $ | (6,878 | ) |  |  | 83 |  |  | $ | 147,625 |  |  | $ | (6,881 | )
U.S. government agencies |  |  | 5,391 |  |  |  | (42 | ) |  |  | 4 |  |  |  | 75,426 |  |  |  | (4,062 | ) |  |  | 67 |  |  |  | 80,817 |  |  |  | (4,104 | )
U.S. government mortgage-backed securities |  |  | 2,659 |  |  |  | (21 | ) |  |  | 2 |  |  |  | 85,071 |  |  |  | (11,094 | ) |  |  | 152 |  |  |  | 87,730 |  |  |  | (11,115 | )
State and political subdivisions |  |  | 13,742 |  |  |  | (253 | ) |  |  | 22 |  |  |  | 223,917 |  |  |  | (16,540 | ) |  |  | 441 |  |  |  | 237,659 |  |  |  | (16,793 | )
Corporate bonds |  |  | 2,451 |  |  |  | (10 | ) |  |  | 3 |  |  |  | 55,842 |  |  |  | (3,791 | ) |  |  | 71 |  |  |  | 58,293 |  |  |  | (3,801 | )
|  | $ | 28,146 |  |  | $ | (329 | ) |  |  | 34 |  |  | $ | 583,978 |  |  | $ | (42,365 | ) |  |  | 814 |  |  | $ | 612,124 |  |  | $ | (42,694 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |
2024: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 5,466 |  |  | $ | (43 | ) |  |  | 2 |  |  | $ | 159,321 |  |  | $ | (8,733 | ) |  |  | 94 |  |  | $ | 164,787 |  |  | $ | (8,776 | )
U.S. government agencies |  |  | 3,953 |  |  |  | (34 | ) |  |  | 2 |  |  |  | 77,166 |  |  |  | (5,160 | ) |  |  | 70 |  |  |  | 81,119 |  |  |  | (5,194 | )
U.S. government mortgage-backed securities |  |  | 3,740 |  |  |  | (64 | ) |  |  | 5 |  |  |  | 86,870 |  |  |  | (12,856 | ) |  |  | 154 |  |  |  | 90,610 |  |  |  | (12,920 | )
State and political subdivisions |  |  | 13,944 |  |  |  | (253 | ) |  |  | 25 |  |  |  | 226,201 |  |  |  | (20,338 | ) |  |  | 440 |  |  |  | 240,145 |  |  |  | (20,591 | )
Corporate bonds |  |  | 3,153 |  |  |  | (27 | ) |  |  | 4 |  |  |  | 56,604 |  |  |  | (4,565 | ) |  |  | 74 |  |  |  | 59,757 |  |  |  | (4,592 | )
|  | $ | 30,256 |  |  | $ | (421 | ) |  |  | 38 |  |  | $ | 606,162 |  |  | $ | (51,652 | ) |  |  | 832 |  |  | $ | 636,418 |  |  | $ | (52,073 | )

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