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Note 5 - Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 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 |  | $ | 163,946 |  |  | $ | 253 |  |  | $ | (5,532 | ) |  | $ | 158,667 |
U.S. government agencies |  |  | 88,726 |  |  |  | 87 |  |  |  | (3,303 | ) |  |  | 85,510 |
U.S. government mortgage-backed securities |  |  | 113,399 |  |  |  | 51 |  |  |  | (9,790 | ) |  |  | 103,660 |
State and political subdivisions |  |  | 249,344 |  |  |  | 138 |  |  |  | (13,844 | ) |  |  | 235,638 |
Corporate bonds |  |  | 64,281 |  |  |  | 60 |  |  |  | (3,114 | ) |  |  | 61,227 |
|  | $ | 679,696 |  |  | $ | 589 |  |  | $ | (35,583 | ) |  | $ | 644,702 |
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 |  | $ | 94,816 |  |  | $ | 93,398 |
Due after one year through five years |  |  | 381,451 |  |  |  | 364,726 |
Due after five years through ten years |  |  | 87,927 |  |  |  | 80,857 |
Due after ten years |  |  | 2,103 |  |  |  | 2,061 |
|  | $ | 566,297 |  |  | $ | 541,042 |
U.S. government mortgage-backed securities |  |  | 113,399 |  |  |  | 103,660 |
Total |  | $ | 679,696 |  |  | $ | 644,702 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 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 |  | $ | 3,020 |  |  | $ | (7 | ) |  |  | 1 |  |  | $ | 126,092 |  |  | $ | (5,525 | ) |  |  | 73 |  |  | $ | 129,112 |  |  | $ | (5,532 | )
U.S. government agencies |  |  | 3,066 |  |  |  | (22 | ) |  |  | 1 |  |  |  | 71,156 |  |  |  | (3,281 | ) |  |  | 64 |  |  |  | 74,222 |  |  |  | (3,303 | )
U.S. government mortgage-backed securities |  |  | 7,751 |  |  |  | (57 | ) |  |  | 5 |  |  |  | 82,612 |  |  |  | (9,733 | ) |  |  | 150 |  |  |  | 90,363 |  |  |  | (9,790 | )
State and political subdivisions |  |  | 9,487 |  |  |  | (167 | ) |  |  | 16 |  |  |  | 212,559 |  |  |  | (13,677 | ) |  |  | 412 |  |  |  | 222,046 |  |  |  | (13,844 | )
Corporate bonds |  |  | 990 |  |  |  | (3 | ) |  |  | 1 |  |  |  | 53,977 |  |  |  | (3,111 | ) |  |  | 67 |  |  |  | 54,967 |  |  |  | (3,114 | )
|  | $ | 24,314 |  |  | $ | (256 | ) |  |  | 24 |  |  | $ | 546,396 |  |  | $ | (35,327 | ) |  |  | 766 |  |  | $ | 570,710 |  |  | $ | (35,583 | )
|  | 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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