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Note 6 - Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
2021: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 138,401 |  |  | $ | 350 |  |  | $ | (716 | ) |  | $ | 138,035 |
U.S. government agencies |  |  | 110,832 |  |  |  | 3,172 |  |  |  | (436 | ) |  |  | 113,568 |
U.S. government mortgage-backed securities |  |  | 158,104 |  |  |  | 1,839 |  |  |  | (1,177 | ) |  |  | 158,766 |
State and political subdivisions |  |  | 271,918 |  |  |  | 5,429 |  |  |  | (695 | ) |  |  | 276,652 |
Corporate bonds |  |  | 75,154 |  |  |  | 3,345 |  |  |  | (97 | ) |  |  | 78,402 |
|  | $ | 754,409 |  |  | $ | 14,135 |  |  | $ | (3,121 | ) |  | $ | 765,423 |
2020: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 11,725 |  |  | $ | 328 |  |  | $ | - |  |  | $ | 12,053 |
U.S. government agencies |  |  | 106,337 |  |  |  | 4,875 |  |  |  | (13 | ) |  |  | 111,199 |
U.S. government mortgage-backed securities |  |  | 146,889 |  |  |  | 3,337 |  |  |  | (31 | ) |  |  | 150,195 |
State and political subdivisions |  |  | 243,438 |  |  |  | 8,182 |  |  |  | (36 | ) |  |  | 251,584 |
Corporate bonds |  |  | 67,247 |  |  |  | 4,722 |  |  |  | (1 | ) |  |  | 71,968 |
|  | $ | 575,636 |  |  | $ | 21,444 |  |  | $ | (81 | ) |  | $ | 596,999 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 47,083 |  |  | $ | 47,560 |
Due after one year through five years |  |  | 353,573 |  |  |  | 358,552 |
Due after five years through ten years |  |  | 321,680 |  |  |  | 326,523 |
Due after ten years |  |  | 32,073 |  |  |  | 32,788 |
Total |  | $ | 754,409 |  |  | $ | 765,423 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Proceeds from sales of securities available-for-sale |  | $ | 622 |  |  | $ | - |  |  | $ | 622 |  |  | $ | 5,463 |
Gross realized gains on securities available-for-sale |  |  | 24 |  |  |  | - |  |  |  | 24 |  |  |  | 430 |
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 |
2021: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 102,182 |  |  | $ | (716 | ) |  | $ | - |  |  | $ | - |  |  | $ | 102,182 |  |  | $ | (716 | )
U.S. government agencies |  |  | 29,722 |  |  |  | (436 | ) |  |  | - |  |  |  | - |  |  |  | 29,722 |  |  |  | (436 | )
U.S. government mortgage-backed securities |  |  | 100,746 |  |  |  | (1,177 | ) |  |  | - |  |  |  | - |  |  |  | 100,746 |  |  |  | (1,177 | )
State and political subdivisions |  |  | 67,527 |  |  |  | (672 | ) |  |  | 896 |  |  |  | (23 | ) |  |  | 68,423 |  |  |  | (695 | )
Corporate bonds |  |  | 9,378 |  |  |  | (97 | ) |  |  | - |  |  |  | - |  |  |  | 9,378 |  |  |  | (97 | )
|  | $ | 309,555 |  |  | $ | (3,098 | ) |  | $ | 896 |  |  | $ | (23 | ) |  | $ | 310,451 |  |  | $ | (3,121 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2020: |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | $ | 6,016 |  |  | $ | (7 | ) |  | $ | 896 |  |  | $ | (6 | ) |  | $ | 6,912 |  |  | $ | (13 | )
U.S. government mortgage-backed securities |  |  | 5,097 |  |  |  | (31 | ) |  |  | - |  |  |  | - |  |  |  | 5,097 |  |  |  | (31 | )
State and political subdivisions |  |  | 7,875 |  |  |  | (34 | ) |  |  | 180 |  |  |  | (2 | ) |  |  | 8,055 |  |  |  | (36 | )
Corporate bonds |  |  | 534 |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | 534 |  |  |  | (1 | )
|  | $ | 19,522 |  |  | $ | (73 | ) |  | $ | 1,076 |  |  | $ | (8 | ) |  | $ | 20,598 |  |  | $ | (81 | )

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