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Note 4 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | September 30, 2022 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 991 |  |  | $ | - |  |  | $ | 59 |  |  | $ | 932 |
U.S. Government agencies and corporations |  |  | 391,473 |  |  |  | 45 |  |  |  | 56,988 |  |  |  | 334,530 |
States and political subdivisions |  |  | 190,361 |  |  |  | 28 |  |  |  | 41,229 |  |  |  | 149,160 |
Mortgage-backed securities |  |  | 176,045 |  |  |  | 23 |  |  |  | 8,824 |  |  |  | 167,244 |
Corporate debt securities |  |  | 6,501 |  |  |  | - |  |  |  | 957 |  |  |  | 5,544 |
Total securities available for sale |  | $ | 765,371 |  |  | $ | 96 |  |  | $ | 108,057 |  |  | $ | 657,410 |
|  | December 31, 2021 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 279,934 |  |  | $ | 2,795 |  |  | $ | 4,710 |  |  | $ | 278,019 |
States and political subdivisions |  |  | 195,365 |  |  |  | 5,314 |  |  |  | 2,007 |  |  |  | 198,672 |
Mortgage-backed securities |  |  | 204,164 |  |  |  | 2,323 |  |  |  | 313 |  |  |  | 206,174 |
Corporate debt securities |  |  | 3,004 |  |  |  | 248 |  |  |  | 37 |  |  |  | 3,215 |
Total securities available for sale |  | $ | 682,467 |  |  | $ | 10,680 |  |  | $ | 7,067 |  |  | $ | 686,080 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2022 |
|  | Amortized Cost |  |  | Fair Value |
Available for Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 1,799 |  |  | $ | 1,798 |
Due after one year through five years |  |  | 133,556 |  |  |  | 124,384 |
Due after five years through ten years |  |  | 324,861 |  |  |  | 276,378 |
Due after ten years |  |  | 305,155 |  |  |  | 254,850 |
Total securities available for sale |  | $ | 765,371 |  |  | $ | 657,410 |
Schedule of Temporary Impairment Losses, Investments [Table Text Block] |
|  | September 30, 2022 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. Treasuries |  | $ | 932 |  |  | $ | 59 |  |  | $ | - |  |  | $ | - |
U.S. Government agencies and corporations |  |  | 207,506 |  |  |  | 25,296 |  |  |  | 124,968 |  |  |  | 31,692 |
States and political subdivisions |  |  | 100,072 |  |  |  | 23,747 |  |  |  | 43,622 |  |  |  | 17,482 |
Mortgage-backed securities |  |  | 152,201 |  |  |  | 7,624 |  |  |  | 12,802 |  |  |  | 1,200 |
Corporate debt securities |  |  | 4,749 |  |  |  | 749 |  |  |  | 795 |  |  |  | 208 |
Total temporarily impaired securities |  | $ | 465,460 |  |  | $ | 57,475 |  |  | $ | 182,187 |  |  | $ | 50,582 |
|  | December 31, 2021 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. Government agencies and corporations |  | $ | 201,650 |  |  | $ | 3,530 |  |  | $ | 26,792 |  |  | $ | 1,180 |
States and political subdivisions |  |  | 50,659 |  |  |  | 1,214 |  |  |  | 20,542 |  |  |  | 793 |
Mortgage-backed securities |  |  | 13,139 |  |  |  | 141 |  |  |  | 4,665 |  |  |  | 172 |
Corporate debt securities |  |  | 966 |  |  |  | 37 |  |  |  | - |  |  |  | - |
Total temporarily impaired securities |  | $ | 266,414 |  |  | $ | 4,922 |  |  | $ | 51,999 |  |  | $ | 2,145 |

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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