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Note 6 - Debt Securities (Tables) | 9 Months Ended
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Sep. 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 |  | $ | 186,405 |  |  | $ | 218 |  |  | $ | (7,840 | ) |  | $ | 178,783 |
U.S. government agencies |  |  | 97,673 |  |  |  | 142 |  |  |  | (4,064 | ) |  |  | 93,751 |
U.S. government mortgage-backed securities |  |  | 104,041 |  |  |  | 7 |  |  |  | (10,142 | ) |  |  | 93,906 |
State and political subdivisions |  |  | 270,717 |  |  |  | 135 |  |  |  | (14,470 | ) |  |  | 256,382 |
Corporate bonds |  |  | 69,035 |  |  |  | 57 |  |  |  | (3,319 | ) |  |  | 65,773 |
|  | $ | 727,871 |  |  | $ | 559 |  |  | $ | (39,835 | ) |  | $ | 688,595 |
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 |  | $ | 106,029 |  |  | $ | 104,557 |
Due after one year through five years |  |  | 380,712 |  |  |  | 364,244 |
Due after five years through ten years |  |  | 128,989 |  |  |  | 118,358 |
Due after ten years |  |  | 8,100 |  |  |  | 7,530 |
|  | $ | 623,830 |  |  | $ | 594,689 |
U.S. government mortgage-backed securities |  |  | 104,041 |  |  |  | 93,906 |
Total |  | $ | 727,871 |  |  | $ | 688,595 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | 716 |  |  | $ | 2,049 |  |  | $ | 2,069 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | 62 |  |  |  | - |  |  |  | 73 |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | (34 | ) |  |  | (165 | ) |  |  | (38 | )
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 |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 170,184 |  |  | $ | (7,840 | ) |  |  | 102 |  |  | $ | 170,184 |  |  | $ | (7,840 | )
U.S. government agencies |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 85,317 |  |  |  | (4,064 | ) |  |  | 73 |  |  |  | 85,317 |  |  |  | (4,064 | )
U.S. government mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 93,339 |  |  |  | (10,142 | ) |  |  | 154 |  |  |  | 93,339 |  |  |  | (10,142 | )
State and political subdivisions |  |  | 2,810 |  |  |  | (14 | ) |  |  | 8 |  |  |  | 236,197 |  |  |  | (14,456 | ) |  |  | 447 |  |  |  | 239,007 |  |  |  | (14,470 | )
Corporate bonds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 61,554 |  |  |  | (3,319 | ) |  |  | 78 |  |  |  | 61,554 |  |  |  | (3,319 | )
|  | $ | 2,810 |  |  | $ | (14 | ) |  |  | 8 |  |  | $ | 646,591 |  |  | $ | (39,821 | ) |  |  | 854 |  |  | $ | 649,401 |  |  | $ | (39,835 | )
|  | 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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