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Note 6 - Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
2023: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 222,047 |  |  | $ | - |  |  | $ | (17,891 | ) |  | $ | 204,156 |
U.S. government agencies |  |  | 109,329 |  |  |  | 3 |  |  |  | (8,769 | ) |  |  | 100,563 |
U.S. government mortgage-backed securities |  |  | 124,494 |  |  |  | 2 |  |  |  | (15,430 | ) |  |  | 109,066 |
State and political subdivisions |  |  | 300,573 |  |  |  | 42 |  |  |  | (27,160 | ) |  |  | 273,455 |
Corporate bonds |  |  | 77,715 |  |  |  | - |  |  |  | (6,435 | ) |  |  | 71,280 |
|  | $ | 834,158 |  |  | $ | 47 |  |  | $ | (75,685 | ) |  | $ | 758,520 |
2022: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
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 |
|  | $ | 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 |  | $ | 64,234 |  |  | $ | 62,668 |
Due after one year through five years |  |  | 409,635 |  |  |  | 378,356 |
Due after five years through ten years |  |  | 226,621 |  |  |  | 200,824 |
Due after ten years |  |  | 9,174 |  |  |  | 7,606 |
|  | $ | 709,664 |  |  | $ | 649,454 |
U.S. government mortgage-backed securities |  |  | 124,494 |  |  |  | 109,066 |
Total |  | $ | 834,158 |  |  | $ | 758,520 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Proceeds from sales of securities available-for-sale |  | $ | 1,353 |  |  | $ | - |  |  | $ | 1,353 |  |  | $ | 535 |
Gross realized gains on securities available-for-sale |  |  | 11 |  |  |  | - |  |  |  | 11 |  |  |  | 35 |
Gross realized losses on securities available-for-sale |  |  | (4 | ) |  |  | - |  |  |  | (4 | ) |  |  | - |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2023: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 3,901 |  |  | $ | (56 | ) |  | $ | 200,255 |  |  | $ | (17,835 | ) |  | $ | 204,156 |  |  | $ | (17,891 | )
U.S. government agencies |  |  | 6,830 |  |  |  | (186 | ) |  |  | 93,144 |  |  |  | (8,583 | ) |  |  | 99,974 |  |  |  | (8,769 | )
U.S. government mortgage-backed securities |  |  | 2,212 |  |  |  | (79 | ) |  |  | 106,525 |  |  |  | (15,351 | ) |  |  | 108,737 |  |  |  | (15,430 | )
State and political subdivisions |  |  | 49,104 |  |  |  | (1,366 | ) |  |  | 216,949 |  |  |  | (25,794 | ) |  |  | 266,053 |  |  |  | (27,160 | )
Corporate bonds |  |  | 11,018 |  |  |  | (371 | ) |  |  | 58,762 |  |  |  | (6,064 | ) |  |  | 69,780 |  |  |  | (6,435 | )
|  | $ | 73,065 |  |  | $ | (2,058 | ) |  | $ | 675,635 |  |  | $ | (73,627 | ) |  | $ | 748,700 |  |  | $ | (75,685 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2022: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 57,882 |  |  | $ | (3,960 | ) |  | $ | 147,215 |  |  | $ | (15,508 | ) |  | $ | 205,097 |  |  | $ | (19,468 | )
U.S. government agencies |  |  | 61,821 |  |  |  | (4,293 | ) |  |  | 38,492 |  |  |  | (5,148 | ) |  |  | 100,313 |  |  |  | (9,441 | )
U.S. government mortgage-backed securities |  |  | 45,440 |  |  |  | (4,393 | ) |  |  | 70,854 |  |  |  | (12,075 | ) |  |  | 116,294 |  |  |  | (16,468 | )
State and political subdivisions |  |  | 181,640 |  |  |  | (14,556 | ) |  |  | 97,907 |  |  |  | (16,647 | ) |  |  | 279,547 |  |  |  | (31,203 | )
Corporate bonds |  |  | 59,293 |  |  |  | (4,281 | ) |  |  | 13,382 |  |  |  | (2,739 | ) |  |  | 72,675 |  |  |  | (7,020 | )
|  | $ | 406,076 |  |  | $ | (31,483 | ) |  | $ | 367,850 |  |  | $ | (52,117 | ) |  | $ | 773,926 |  |  | $ | (83,600 | )

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