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Note 4 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | March 31, 2022 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 989 |  |  | $ | - |  |  | $ | 25 |  |  | $ | 964 |
U.S. Government agencies and corporations |  |  | 344,348 |  |  |  | 904 |  |  |  | 22,864 |  |  |  | 322,388 |
States and political subdivisions |  |  | 193,185 |  |  |  | 416 |  |  |  | 14,801 |  |  |  | 178,800 |
Mortgage-backed securities |  |  | 193,538 |  |  |  | 70 |  |  |  | 2,722 |  |  |  | 190,886 |
Corporate debt securities |  |  | 6,499 |  |  |  | - |  |  |  | 183 |  |  |  | 6,316 |
Total securities available for sale |  | $ | 738,559 |  |  | $ | 1,390 |  |  | $ | 40,595 |  |  | $ | 699,354 |
|  | 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] |
|  | March 31, 2022 |
|  | Amortized Cost |  |  | Fair Value |
Available for Sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 1,317 |  |  | $ | 1,325 |
Due after one year through five years |  |  | 79,070 |  |  |  | 77,180 |
Due after five years through ten years |  |  | 329,371 |  |  |  | 310,296 |
Due after ten years |  |  | 328,801 |  |  |  | 310,553 |
Total securities available for sale |  | $ | 738,559 |  |  | $ | 699,354 |
Schedule of Temporary Impairment Losses, Investments [Table Text Block] |
|  | March 31, 2022 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. Treasuries |  | $ | 964 |  |  | $ | 25 |  |  | $ | - |  |  | $ | - |
U.S. Government agencies and corporations |  |  | 238,220 |  |  |  | 14,294 |  |  |  | 68,352 |  |  |  | 8,570 |
States and political subdivisions |  |  | 120,206 |  |  |  | 8,951 |  |  |  | 36,298 |  |  |  | 5,850 |
Mortgage-backed securities |  |  | 160,387 |  |  |  | 2,262 |  |  |  | 9,623 |  |  |  | 460 |
Corporate debt securities |  |  | 5,317 |  |  |  | 183 |  |  |  | - |  |  |  | - |
Total temporarily impaired securities |  | $ | 525,094 |  |  | $ | 25,715 |  |  | $ | 114,273 |  |  | $ | 14,880 |
|  | December 31, 2021 |
|  | Less Than 12 Months |
|  | 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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