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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  |  |  |  |  | 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 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 227,065 |  |  | $ | - |  |  | $ | (19,468 | ) |  | $ | 207,597 |
U.S. government agencies |  |  | 110,370 |  |  |  | 4 |  |  |  | (9,441 | ) |  |  | 100,933 |
U.S. government mortgage-backed securities |  |  | 133,205 |  |  |  | 4 |  |  |  | (16,468 | ) |  |  | 116,741 |
State and political subdivisions |  |  | 317,179 |  |  |  | 27 |  |  |  | (31,203 | ) |  |  | 286,003 |
Corporate bonds |  |  | 82,177 |  |  |  | 7 |  |  |  | (7,020 | ) |  |  | 75,164 |
Total |  | $ | 869,996 |  |  | $ | 42 |  |  | $ | (83,600 | ) |  | $ | 786,438 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 82,517 |  |  | $ | 80,981 |
Due after one year through five years |  |  | 395,006 |  |  |  | 370,101 |
Due after five years through ten years |  |  | 196,227 |  |  |  | 175,993 |
Due after ten years |  |  | 8,965 |  |  |  | 7,450 |
|  | $ | 682,715 |  |  | $ | 634,525 |
U.S. government mortgage-backed securities |  |  | 115,988 |  |  |  | 101,864 |
Total |  | $ | 798,703 |  |  | $ | 736,389 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 2023 |  |  | 2022 |
Proceeds from sales of securities available-for-sale |  | $ | 2,069 |  |  | $ | 10,548 |
Gross realized gains on securities available-for-sale |  |  | 73 |  |  |  | 60 |
Gross realized losses on securities available-for-sale |  |  | (38 | ) |  |  | (23 | )
Gain (Loss) on Securities [Table Text Block] |
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 | )
2022: |  | 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 |  | $ | 57,882 |  |  | $ | (3,960 | ) |  |  | 45 |  |  | $ | 147,215 |  |  | $ | (15,508 | ) |  |  | 89 |  |  |  | 205,097 |  |  |  | (19,468 | )
U.S. government agencies |  |  | 61,821 |  |  |  | (4,293 | ) |  |  | 51 |  |  |  | 38,492 |  |  |  | (5,148 | ) |  |  | 32 |  |  |  | 100,313 |  |  |  | (9,441 | )
U.S. government mortgage-backed securities |  |  | 45,440 |  |  |  | (4,393 | ) |  |  | 104 |  |  |  | 70,854 |  |  |  | (12,075 | ) |  |  | 57 |  |  |  | 116,294 |  |  |  | (16,468 | )
State and political subdivisions |  |  | 181,640 |  |  |  | (14,556 | ) |  |  | 335 |  |  |  | 97,907 |  |  |  | (16,647 | ) |  |  | 203 |  |  |  | 279,547 |  |  |  | (31,203 | )
Corporate bonds |  |  | 59,293 |  |  |  | (4,281 | ) |  |  | 71 |  |  |  | 13,382 |  |  |  | (2,739 | ) |  |  | 23 |  |  |  | 72,675 |  |  |  | (7,020 | )
Total |  | $ | 406,076 |  |  | $ | (31,483 | ) |  |  | 606 |  |  | $ | 367,850 |  |  | $ | (52,117 | ) |  |  | 404 |  |  | $ | 773,926 |  |  | $ | (83,600 | )

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