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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Total |  | $ | 700,528 |  |  | $ | 58 |  |  | $ | (52,073 | ) |  | $ | 648,513 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 213,646 |  |  | $ | 29 |  |  | $ | (13,587 | ) |  | $ | 200,088 |
U.S. government agencies |  |  | 99,455 |  |  |  | 2 |  |  |  | (6,842 | ) |  |  | 92,615 |
U.S. government mortgage-backed securities |  |  | 115,988 |  |  |  | - |  |  |  | (14,124 | ) |  |  | 101,864 |
State and political subdivisions |  |  | 292,475 |  |  |  | 93 |  |  |  | (22,677 | ) |  |  | 269,891 |
Corporate bonds |  |  | 77,139 |  |  |  | 11 |  |  |  | (5,219 | ) |  |  | 71,931 |
Total |  | $ | 798,703 |  |  | $ | 135 |  |  | $ | (62,449 | ) |  | $ | 736,389 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 105,290 |  |  | $ | 103,737 |
Due after one year through five years |  |  | 374,000 |  |  |  | 350,187 |
Due after five years through ten years |  |  | 109,174 |  |  |  | 96,627 |
Due after ten years |  |  | 8,100 |  |  |  | 6,912 |
|  | $ | 596,564 |  |  | $ | 557,463 |
U.S. government mortgage-backed securities |  |  | 103,964 |  |  |  | 91,050 |
Total |  | $ | 700,528 |  |  | $ | 648,513 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 2024 |  |  | 2023 |
Proceeds from sales of securities available-for-sale |  | $ | 2,049 |  |  | $ | 2,069 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | 73 |
Gross realized losses on securities available-for-sale |  |  | (165 | ) |  |  | (38 | )
Gain (Loss) on Securities [Table Text Block] |
2024: |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Gross |  |  |  |  |  |  | Estimated |  |  | Gross |  |  |  |  |  |  | Estimated |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Securities |  |  | Value |  |  | Losses |  |  | Securities |  |  | 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 | )
Total |  | $ | 30,256 |  |  | $ | (421 | ) |  |  | 38 |  |  | $ | 606,162 |  |  | $ | (51,652 | ) |  |  | 832 |  |  | $ | 636,418 |  |  | $ | (52,073 | )
2023: |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Gross |  |  |  |  |  |  | Estimated |  |  | Gross |  |  |  |  |  |  | Estimated |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Securities |  |  | Value |  |  | Losses |  |  | Securities |  |  | Value |  |  | Losses |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 196,432 |  |  | $ | (13,587 | ) |  |  | 121 |  |  | $ | 196,432 |  |  | $ | (13,587 | )
U.S. government agencies |  |  | 1,986 |  |  |  | (11 | ) |  |  | 2 |  |  |  | 90,137 |  |  |  | (6,831 | ) |  |  | 78 |  |  |  | 92,123 |  |  |  | (6,842 | )
U.S. government mortgage-backed securities |  |  | 467 |  |  |  | (12 | ) |  |  | 4 |  |  |  | 101,265 |  |  |  | (14,112 | ) |  |  | 155 |  |  |  | 101,732 |  |  |  | (14,124 | )
State and political subdivisions |  |  | 9,054 |  |  |  | (73 | ) |  |  | 18 |  |  |  | 251,286 |  |  |  | (22,604 | ) |  |  | 474 |  |  |  | 260,340 |  |  |  | (22,677 | )
Corporate bonds |  |  | 3,117 |  |  |  | (108 | ) |  |  | 4 |  |  |  | 67,816 |  |  |  | (5,111 | ) |  |  | 84 |  |  |  | 70,933 |  |  |  | (5,219 | )
Total |  | $ | 14,624 |  |  | $ | (204 | ) |  |  | 28 |  |  | $ | 706,936 |  |  | $ | (62,245 | ) |  |  | 912 |  |  | $ | 721,560 |  |  | $ | (62,449 | )

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