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Note 6 - Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
2022: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 230,063 |  |  | $ | - |  |  | $ | (21,977 | ) |  | $ | 208,086 |
U.S. government agencies |  |  | 114,018 |  |  |  | 5 |  |  |  | (10,380 | ) |  |  | 103,643 |
U.S. government mortgage-backed securities |  |  | 138,117 |  |  |  | 6 |  |  |  | (19,766 | ) |  |  | 118,357 |
State and political subdivisions |  |  | 316,532 |  |  |  | 5 |  |  |  | (36,048 | ) |  |  | 280,489 |
Corporate bonds |  |  | 81,713 |  |  |  | - |  |  |  | (8,321 | ) |  |  | 73,392 |
|  | $ | 880,443 |  |  | $ | 16 |  |  | $ | (96,492 | ) |  | $ | 783,967 |
2021: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 192,323 |  |  | $ | 239 |  |  | $ | (2,083 | ) |  | $ | 190,479 |
U.S. government agencies |  |  | 114,531 |  |  |  | 2,235 |  |  |  | (752 | ) |  |  | 116,014 |
U.S. government mortgage-backed securities |  |  | 149,896 |  |  |  | 1,375 |  |  |  | (1,670 | ) |  |  | 149,601 |
State and political subdivisions |  |  | 290,548 |  |  |  | 4,035 |  |  |  | (1,724 | ) |  |  | 292,859 |
Corporate bonds |  |  | 79,887 |  |  |  | 2,437 |  |  |  | (274 | ) |  |  | 82,050 |
|  | $ | 827,185 |  |  | $ | 10,321 |  |  | $ | (6,503 | ) |  | $ | 831,003 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 32,318 |  |  | $ | 32,029 |
Due after one year through five years |  |  | 452,629 |  |  |  | 414,093 |
Due after five years through ten years |  |  | 382,700 |  |  |  | 326,965 |
Due after ten years |  |  | 12,796 |  |  |  | 10,880 |
Total |  | $ | 880,443 |  |  | $ | 783,967 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Proceeds from sales of securities available-for-sale |  | $ | 10,013 |  |  | $ | 622 |  |  | $ | 10,548 |  |  | $ | 622 |
Gross realized gains on securities available-for-sale |  |  | 25 |  |  |  | 24 |  |  |  | 60 |  |  |  | 24 |
Gross realized losses on securities available-for-sale |  |  | (23 | ) |  |  | - |  |  |  | (23 | ) |  |  | - |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | 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 |  | $ | 119,179 |  |  | $ | (10,309 | ) |  | $ | 88,907 |  |  | $ | (11,668 | ) |  | $ | 208,086 |  |  | $ | (21,977 | )
U.S. government agencies |  |  | 76,888 |  |  |  | (6,433 | ) |  |  | 26,095 |  |  |  | (3,947 | ) |  |  | 102,983 |  |  |  | (10,380 | )
U.S. government mortgage-backed securities |  |  | 47,837 |  |  |  | (5,541 | ) |  |  | 69,785 |  |  |  | (14,225 | ) |  |  | 117,622 |  |  |  | (19,766 | )
State and political subdivisions |  |  | 218,288 |  |  |  | (23,921 | ) |  |  | 59,639 |  |  |  | (12,127 | ) |  |  | 277,927 |  |  |  | (36,048 | )
Corporate bonds |  |  | 63,812 |  |  |  | (6,032 | ) |  |  | 9,580 |  |  |  | (2,289 | ) |  |  | 73,392 |  |  |  | (8,321 | )
|  | $ | 526,004 |  |  | $ | (52,236 | ) |  | $ | 254,006 |  |  | $ | (44,256 | ) |  | $ | 780,010 |  |  | $ | (96,492 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2021: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 163,206 |  |  | $ | (2,083 | ) |  | $ | - |  |  | $ | - |  |  | $ | 163,206 |  |  | $ | (2,083 | )
U.S. government agencies |  |  | 30,647 |  |  |  | (570 | ) |  |  | 5,836 |  |  |  | (182 | ) |  |  | 36,483 |  |  |  | (752 | )
U.S. government mortgage-backed securities |  |  | 92,192 |  |  |  | (1,580 | ) |  |  | 2,524 |  |  |  | (90 | ) |  |  | 94,716 |  |  |  | (1,670 | )
State and political subdivisions |  |  | 115,204 |  |  |  | (1,667 | ) |  |  | 1,725 |  |  |  | (57 | ) |  |  | 116,929 |  |  |  | (1,724 | )
Corporate bonds |  |  | 16,484 |  |  |  | (274 | ) |  |  | - |  |  |  | - |  |  |  | 16,484 |  |  |  | (274 | )
|  | $ | 417,733 |  |  | $ | (6,174 | ) |  | $ | 10,085 |  |  | $ | (329 | ) |  | $ | 427,818 |  |  | $ | (6,503 | )

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