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Note 6 - Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
2024: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 195,837 |  |  | $ | 11 |  |  | $ | (12,242 | ) |  | $ | 183,606 |
U.S. government agencies |  |  | 101,005 |  |  |  | 6 |  |  |  | (6,502 | ) |  |  | 94,509 |
U.S. government mortgage-backed securities |  |  | 108,189 |  |  |  | 4 |  |  |  | (14,045 | ) |  |  | 94,148 |
State and political subdivisions |  |  | 272,917 |  |  |  | 43 |  |  |  | (22,073 | ) |  |  | 250,887 |
Corporate bonds |  |  | 73,067 |  |  |  | - |  |  |  | (5,374 | ) |  |  | 67,693 |
|  | $ | 751,015 |  |  | $ | 64 |  |  | $ | (60,236 | ) |  | $ | 690,843 |
2023: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
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 |
|  | $ | 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 |  | $ | 102,150 |  |  | $ | 100,092 |
Due after one year through five years |  |  | 385,150 |  |  |  | 358,508 |
Due after five years through ten years |  |  | 147,426 |  |  |  | 130,796 |
Due after ten years |  |  | 8,100 |  |  |  | 7,299 |
|  | $ | 642,826 |  |  | $ | 596,695 |
U.S. government mortgage-backed securities |  |  | 108,189 |  |  |  | 94,148 |
Total |  | $ | 751,015 |  |  | $ | 690,843 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | 1,353 |  |  | $ | 2,049 |  |  | $ | 1,353 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | 11 |  |  |  | - |  |  |  | 11 |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | (4 | ) |  |  | (165 | ) |  |  | (4 | )
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 |
2024: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 4,518 |  |  | $ | (28 | ) |  |  | 2 |  |  | $ | 175,289 |  |  | $ | (12,214 | ) |  |  | 108 |  |  | $ | 179,807 |  |  | $ | (12,242 | )
U.S. government agencies |  |  | 1,957 |  |  |  | (2 | ) |  |  | 1 |  |  |  | 88,106 |  |  |  | (6,500 | ) |  |  | 77 |  |  |  | 90,063 |  |  |  | (6,502 | )
U.S. government mortgage-backed securities |  |  | 121 |  |  |  | (1 | ) |  |  | 2 |  |  |  | 93,635 |  |  |  | (14,044 | ) |  |  | 155 |  |  |  | 93,756 |  |  |  | (14,045 | )
State and political subdivisions |  |  | 4,556 |  |  |  | (97 | ) |  |  | 12 |  |  |  | 241,843 |  |  |  | (21,976 | ) |  |  | 467 |  |  |  | 246,399 |  |  |  | (22,073 | )
Corporate bonds |  |  | 3,091 |  |  |  | (117 | ) |  |  | 3 |  |  |  | 64,602 |  |  |  | (5,257 | ) |  |  | 82 |  |  |  | 67,693 |  |  |  | (5,374 | )
|  | $ | 14,243 |  |  | $ | (245 | ) |  |  | 20 |  |  | $ | 663,475 |  |  | $ | (59,991 | ) |  |  | 889 |  |  | $ | 677,718 |  |  | $ | (60,236 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |
2023: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair 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 | )
|  | $ | 14,624 |  |  | $ | (204 | ) |  |  | 28 |  |  | $ | 706,936 |  |  | $ | (62,245 | ) |  |  | 912 |  |  | $ | 721,560 |  |  | $ | (62,449 | )

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