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Note 6 - Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 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 |  | $ | 212,757 |  |  | $ | 16 |  |  | $ | (11,886 | ) |  | $ | 200,887 |
U.S. government agencies |  |  | 116,513 |  |  |  | 99 |  |  |  | (4,444 | ) |  |  | 112,168 |
U.S. government mortgage-backed securities |  |  | 151,333 |  |  |  | 90 |  |  |  | (8,916 | ) |  |  | 142,507 |
State and political subdivisions |  |  | 302,881 |  |  |  | 296 |  |  |  | (13,964 | ) |  |  | 289,213 |
Corporate bonds |  |  | 81,664 |  |  |  | 235 |  |  |  | (2,777 | ) |  |  | 79,122 |
|  | $ | 865,148 |  |  | $ | 736 |  |  | $ | (41,987 | ) |  | $ | 823,897 |
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 |  | $ | 43,084 |  |  | $ | 43,195 |
Due after one year through five years |  |  | 459,166 |  |  |  | 439,613 |
Due after five years through ten years |  |  | 340,100 |  |  |  | 319,708 |
Due after ten years |  |  | 22,798 |  |  |  | 21,381 |
Total |  | $ | 865,148 |  |  | $ | 823,897 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2022 |  |  | 2021 |
Proceeds from sales of securities available-for-sale |  | $ | 535 |  |  | $ | - |
Gross realized gains on securities available-for-sale |  |  | 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 |  | $ | 181,570 |  |  | $ | (10,962 | ) |  | $ | 11,487 |  |  | $ | (924 | ) |  | $ | 193,057 |  |  | $ | (11,886 | )
U.S. government agencies |  |  | 77,732 |  |  |  | (3,006 | ) |  |  | 15,671 |  |  |  | (1,438 | ) |  |  | 93,403 |  |  |  | (4,444 | )
U.S. government mortgage-backed securities |  |  | 82,105 |  |  |  | (4,063 | ) |  |  | 51,997 |  |  |  | (4,853 | ) |  |  | 134,102 |  |  |  | (8,916 | )
State and political subdivisions |  |  | 218,589 |  |  |  | (11,894 | ) |  |  | 19,703 |  |  |  | (2,070 | ) |  |  | 238,292 |  |  |  | (13,964 | )
Corporate bonds |  |  | 43,356 |  |  |  | (2,603 | ) |  |  | 1,460 |  |  |  | (174 | ) |  |  | 44,816 |  |  |  | (2,777 | )
|  | $ | 603,352 |  |  | $ | (32,528 | ) |  | $ | 100,318 |  |  | $ | (9,459 | ) |  | $ | 703,670 |  |  | $ | (41,987 | )
|  | 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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