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Note 4 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
|  | September 30, 2021
|  | Amortized Costs |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Values
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 220,372 |  |  | $ | 3,062 |  |  | $ | 3,243 |  |  | $ | 220,191 |
States and political subdivisions |  |  | 196,518 |  |  |  | 4,970 |  |  |  | 2,181 |  |  |  | 199,307 |
Mortgage-backed securities |  |  | 215,661 |  |  |  | 3,284 |  |  |  | 193 |  |  |  | 218,752 |
Corporate debt securities |  |  | 3,004 |  |  |  | 259 |  |  |  | 27 |  |  |  | 3,236 |
Total securities available for sale |  | $ | 635,555 |  |  | $ | 11,575 |  |  | $ | 5,644 |  |  | $ | 641,486 |
|  | December 31, 2020
|  | Amortized Costs |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Values
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 86,859 |  |  | $ | 4,477 |  |  | $ | 173 |  |  | $ | 91,163 |
States and political subdivisions |  |  | 196,435 |  |  |  | 7,778 |  |  |  | 252 |  |  |  | 203,961 |
Mortgage-backed securities |  |  | 244,780 |  |  |  | 4,473 |  |  |  | 78 |  |  |  | 249,175 |
Corporate debt securities |  |  | 2,001 |  |  |  | 442 |  |  |  | - |  |  |  | 2,443 |
Total securities available for sale |  | $ | 530,075 |  |  | $ | 17,170 |  |  | $ | 503 |  |  | $ | 546,742 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2021
|  | Amortized Cost |  | Fair Value
Available for Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 1,864 |  |  | $ | 1,902 |
Due after one year through five years |  |  | 8,722 |  |  |  | 8,785 |
Due after five years through ten years |  |  | 264,217 |  |  |  | 265,751 |
Due after ten years |  |  | 360,752 |  |  |  | 365,048 |
Total securities available for sale |  | $ | 635,555 |  |  | $ | 641,486 |
Schedule of Temporary Impairment Losses, Investments [Table Text Block] |
|  | September 30, 2021
|  | Less Than 12 Months |  | 12 Months or More
|  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Temporarily Impaired Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 156,418 |  |  | $ | 3,190 |  |  | $ | 944 |  |  | $ | 53 |
States and political subdivisions |  |  | 71,912 |  |  |  | 1,868 |  |  |  | 9,026 |  |  |  | 313 |
Mortgage-backed securities |  |  | 10,229 |  |  |  | 46 |  |  |  | 5,146 |  |  |  | 147 |
Corporate debt securities |  |  | 976 |  |  |  | 27 |  |  |  | - |  |  |  | - |
Total |  | $ | 239,535 |  |  | $ | 5,131 |  |  | $ | 15,116 |  |  | $ | 513 |
|  | December 31, 2020
|  | Less Than 12 Months |  | 12 Months or More
|  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Temporarily Impaired Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 28,798 |  |  | $ | 173 |  |  | $ | - |  |  | $ | - |
States and political subdivisions |  |  | 32,353 |  |  |  | 249 |  |  |  | 635 |  |  |  | 3 |
Mortgage-backed securities |  |  | 8,816 |  |  |  | 76 |  |  |  | 4,060 |  |  |  | 2 |
Total |  | $ | 69,967 |  |  | $ | 498 |  |  | $ | 4,695 |  |  | $ | 5 |

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- Definition Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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