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Note 7 - Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
2020: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 8,492 |  |  | $ | 364 |  |  | $ | - |  |  | $ | 8,856 |
U.S. government agencies |  |  | 92,650 |  |  |  | 5,340 |  |  |  | (6 | ) |  |  | 97,984 |
U.S. government mortgage-backed securities |  |  | 130,706 |  |  |  | 3,140 |  |  |  | (50 | ) |  |  | 133,796 |
State and political subdivisions |  |  | 226,574 |  |  |  | 7,024 |  |  |  | (35 | ) |  |  | 233,563 |
Corporate bonds |  |  | 69,744 |  |  |  | 4,875 |  |  |  | - |  |  |  | 74,619 |
|  | $ | 528,166 |  |  | $ | 20,743 |  |  | $ | (91 | ) |  | $ | 548,818 |
2019: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
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 |
|  | $ | 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 |  | $ | 46,260 |  |  | $ | 46,694 |
Due after one year through five years |  |  | 226,833 |  |  |  | 236,081 |
Due after five years through ten years |  |  | 211,689 |  |  |  | 220,972 |
Due after ten years |  |  | 43,384 |  |  |  | 45,071 |
Total |  | $ | 528,166 |  |  | $ | 548,818 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | 2,238 |  |  | $ | 5,463 |  |  | $ | 8,211 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | 16 |  |  |  | 430 |  |  |  | 37 |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | (1 | ) |  |  | - |  |  |  | (20 | )
Tax provision applicable to net realized gains on securities available-for-sale |  |  | - |  |  |  | 4 |  |  |  | 108 |  |  |  | 4 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2020: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | $ | - |  |  | $ | - |  |  | $ | 917 |  |  | $ | (6 | ) |  | $ | 917 |  |  | $ | (6 | )
U.S. government mortgage-backed securities |  |  | 21,671 |  |  |  | (50 | ) |  |  | - |  |  |  | - |  |  |  | 21,671 |  |  |  | (50 | )
State and political subdivisions |  |  | 5,924 |  |  |  | (32 | ) |  |  | 180 |  |  |  | (3 | ) |  |  | 6,104 |  |  |  | (35 | )
|  | $ | 27,595 |  |  | $ | (82 | ) |  | $ | 1,097 |  |  | $ | (9 | ) |  | $ | 28,692 |  |  | $ | (91 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2019: |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized 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 | )
|  | $ | 63,376 |  |  | $ | (268 | ) |  | $ | 10,408 |  |  | $ | (180 | ) |  | $ | 73,784 |  |  | $ | (448 | )

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