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Note 4 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Total |  | $ | 575,636 |  |  | $ | 21,444 |  |  | $ | (81 | ) |  | $ | 596,999 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 9,392 |  |  | $ | 64 |  |  | $ | (4 | ) |  | $ | 9,452 |
U.S. government agencies |  |  | 124,913 |  |  |  | 1,609 |  |  |  | (89 | ) |  |  | 126,433 |
U.S. government mortgage-backed securities |  |  | 80,295 |  |  |  | 867 |  |  |  | (34 | ) |  |  | 81,128 |
State and political subdivisions |  |  | 193,745 |  |  |  | 1,852 |  |  |  | (295 | ) |  |  | 195,302 |
Corporate bonds |  |  | 66,012 |  |  |  | 1,542 |  |  |  | (26 | ) |  |  | 67,528 |
Total |  | $ | 474,357 |  |  | $ | 5,934 |  |  | $ | (448 | ) |  | $ | 479,843 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 44,983 |  |  | $ | 45,329 |
Due after one year through five years |  |  | 242,363 |  |  |  | 251,324 |
Due after five years through ten years |  |  | 237,913 |  |  |  | 247,562 |
Due after ten years |  |  | 50,377 |  |  |  | 52,784 |
Total |  | $ | 575,636 |  |  | $ | 596,999 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 2020 |  |  | 2019 |
Proceeds from sales of securities available-for-sale |  | $ | 5,463 |  |  | $ | 8,211 |
Gross realized gains on securities available-for-sale |  |  | 430 |  |  |  | 37 |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | 20 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
2020: |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Gross |  |  | Estimated |  |  | Gross |  |  | Estimated |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | 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 | )
Total |  | $ | 19,522 |  |  | $ | (73 | ) |  | $ | 1,076 |  |  | $ | (8 | ) |  | $ | 20,598 |  |  | $ | (81 | )
2019: |  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Gross |  |  | Estimated |  |  | Gross |  |  | Estimated |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 3,023 |  |  | $ | (4 | ) |  | $ | - |  |  | $ | - |  |  | $ | 3,023 |  |  | $ | (4 | )
U.S. government agencies |  |  | 23,827 |  |  |  | (85 | ) |  |  | 2,520 |  |  |  | (4 | ) |  |  | 26,347 |  |  |  | (89 | )
U.S. government mortgage-backed securities |  |  | 14,885 |  |  |  | (28 | ) |  |  | 1,934 |  |  |  | (6 | ) |  |  | 16,819 |  |  |  | (34 | )
State and political subdivisions |  |  | 17,512 |  |  |  | (125 | ) |  |  | 5,954 |  |  |  | (170 | ) |  |  | 23,466 |  |  |  | (295 | )
Corporate bonds |  |  | 4,129 |  |  |  | (26 | ) |  |  | - |  |  |  | - |  |  |  | 4,129 |  |  |  | (26 | )
Total |  | $ | 63,376 |  |  | $ | (268 | ) |  | $ | 10,408 |  |  | $ | (180 | ) |  | $ | 73,784 |  |  | $ | (448 | )

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