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Note 6 - Debt Securities (Tables) | 6 Months Ended
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Jun. 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 |  | $ | 224,177 |  |  | $ | 1 |  |  | $ | (16,048 | ) |  | $ | 208,130 |
U.S. government agencies |  |  | 116,945 |  |  |  | 13 |  |  |  | (6,809 | ) |  |  | 110,149 |
U.S. government mortgage-backed securities |  |  | 144,619 |  |  |  | 16 |  |  |  | (13,728 | ) |  |  | 130,907 |
State and political subdivisions |  |  | 322,916 |  |  |  | 120 |  |  |  | (24,303 | ) |  |  | 298,733 |
Corporate bonds |  |  | 85,768 |  |  |  | 24 |  |  |  | (5,322 | ) |  |  | 80,470 |
|  | $ | 894,425 |  |  | $ | 174 |  |  | $ | (66,210 | ) |  | $ | 828,389 |
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 |  | $ | 36,141 |  |  | $ | 36,012 |
Due after one year through five years |  |  | 456,498 |  |  |  | 430,508 |
Due after five years through ten years |  |  | 383,933 |  |  |  | 346,032 |
Due after ten years |  |  | 17,853 |  |  |  | 15,837 |
Total |  | $ | 894,425 |  |  | $ | 828,389 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |  |  | Three Months Ended |
|  | June 30, |  |  | June 30, |  |  | March 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | - |  |  | $ | 535 |  |  | $ | - |  |  | $ | 535 |  |  | $ | - |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | - |  |  |  | 35 |  |  |  | - |  |  |  | 35 |  |  |  | - |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
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 |  | $ | 195,931 |  |  | $ | (14,887 | ) |  | $ | 11,227 |  |  | $ | (1,161 | ) |  | $ | 207,158 |  |  | $ | (16,048 | )
U.S. government agencies |  |  | 94,147 |  |  |  | (5,000 | ) |  |  | 15,295 |  |  |  | (1,809 | ) |  |  | 109,442 |  |  |  | (6,809 | )
U.S. government mortgage-backed securities |  |  | 81,207 |  |  |  | (6,843 | ) |  |  | 48,176 |  |  |  | (6,885 | ) |  |  | 129,383 |  |  |  | (13,728 | )
State and political subdivisions |  |  | 248,471 |  |  |  | (21,340 | ) |  |  | 19,269 |  |  |  | (2,963 | ) |  |  | 267,740 |  |  |  | (24,303 | )
Corporate bonds |  |  | 70,129 |  |  |  | (5,090 | ) |  |  | 1,396 |  |  |  | (232 | ) |  |  | 71,525 |  |  |  | (5,322 | )
|  | $ | 689,885 |  |  | $ | (53,160 | ) |  | $ | 95,363 |  |  | $ | (13,050 | ) |  | $ | 785,248 |  |  | $ | (66,210 | )
|  | 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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