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Note 2 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | December 31, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 2,836 |  |  | $ | 60 |  |  | $ | - |  |  | $ | 2,896 |
|  | December 31, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 2,426 |  |  | $ | 425 |  |  | $ | - |  |  | $ | 2,851 |
Debt Securities, Available-for-sale [Table Text Block] |
|  | December 31, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 2,007 |  |  | $ | 44 |  |  | $ | - |  |  | $ | 2,051 |
U.S. Treasury notes and bonds |  |  | 1,996 |  |  |  | 60 |  |  |  | - |  |  |  | 2,056 |
State and municipal |  |  | 307,201 |  |  |  | 13,191 |  |  |  | (24 | ) |  |  | 320,368 |
Mortgage-backed |  |  | 246,085 |  |  |  | 1,510 |  |  |  | (872 | ) |  |  | 246,723 |
Corporate |  |  | 2,539 |  |  |  | 51 |  |  |  | (1 | ) |  |  | 2,589 |
Trust preferred securities |  |  | 1,000 |  |  |  | - |  |  |  | - |  |  |  | 1,000 |
Total |  | $ | 560,828 |  |  | $ | 14,856 |  |  | $ | (897 | ) |  | $ | 574,787 |
|  | December 31, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 17,231 |  |  | $ | 23 |  |  | $ | (39 | ) |  | $ | 17,215 |
U.S. Treasury notes and bonds |  |  | 1,994 |  |  |  | 14 |  |  |  | - |  |  |  | 2,008 |
State and municipal |  |  | 172,487 |  |  |  | 2,694 |  |  |  | (1,257 | ) |  |  | 173,924 |
Mortgage-backed |  |  | 142,504 |  |  |  | 585 |  |  |  | (329 | ) |  |  | 142,760 |
Corporate |  |  | 2,649 |  |  |  | 24 |  |  |  | (1 | ) |  |  | 2,672 |
Trust preferred securities |  |  | 1,000 |  |  |  | - |  |  |  | - |  |  |  | 1,000 |
Total |  | $ | 337,865 |  |  | $ | 3,340 |  |  | $ | (1,626 | ) |  | $ | 339,579 |
Schedule of Realized Gain (Loss) [Table Text Block] |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Proceeds from sales of securities |  | $ | 121,942 |  |  | $ | 178,913 |  |  | $ | 2,634 |
Gross realized gains |  |  | 1,308 |  |  |  | 22 |  |  |  | 42 |
Gross realized losses |  |  | - |  |  |  | - |  |  |  | 8 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(Dollars in thousands) |  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due within one year |  | $ | 17,050 |  |  | $ | 17,184 |
Due after one year through five years |  |  | 59,120 |  |  |  | 60,900 |
Due after five years through ten years |  |  | 221,304 |  |  |  | 231,775 |
Due after ten years |  |  | 17,269 |  |  |  | 18,205 |
Total debt securities |  |  | 314,743 |  |  |  | 328,064 |
Mortgage-backed securities |  |  | 246,085 |  |  |  | 246,723 |
Equity securities |  |  | 2,836 |  |  |  | 2,896 |
Total |  | $ | 563,664 |  |  | $ | 577,683 |
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] |
(Dollars in thousands) |  | 2020 |  |  | 2019 |
Securities pledged for Community Reinvestment Act credits |  | $ | 278 |  |  | $ | 252 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | 2020 |
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
(Dollars in thousands) |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. Government and federal agency |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
U.S. Treasury notes and bonds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
State and municipal |  |  | 8,950 |  |  |  | 24 |  |  |  | - |  |  |  | - |  |  |  | 8,950 |  |  |  | 24 |
Mortgage-backed |  |  | 75,126 |  |  |  | 866 |  |  |  | 9,994 |  |  |  | 6 |  |  |  | 85,120 |  |  |  | 872 |
Corporate |  |  | 453 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 453 |  |  |  | 1 |
Total temporarily impaired |  | $ | 84,529 |  |  | $ | 891 |  |  | $ | 9,994 |  |  | $ | 6 |  |  | $ | 94,523 |  |  | $ | 897 |
|  | 2019 |
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
(Dollars in thousands) |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. Government and federal agency |  | $ | 7,175 |  |  | $ | (39 | ) |  | $ | - |  |  | $ | - |  |  | $ | 7,175 |  |  | $ | (39 | )
U.S. Treasury notes and bonds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
State and municipal |  |  | 75,099 |  |  |  | (1,256 | ) |  |  | 252 |  |  |  | (1 | ) |  |  | 75,351 |  |  |  | (1,257 | )
Mortgage-backed |  |  | 109,652 |  |  |  | (327 | ) |  |  | 373 |  |  |  | (2 | ) |  |  | 110,025 |  |  |  | (329 | )
Corporate |  |  | - |  |  |  | - |  |  |  | 300 |  |  |  | (1 | ) |  |  | 300 |  |  |  | (1 | )
Total temporarily impaired |  | $ | 191,926 |  |  | $ | (1,622 | ) |  | $ | 925 |  |  | $ | (4 | ) |  | $ | 192,851 |  |  | $ | (1,626 | )
Gain (Loss) on Securities [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net gains and losses recognized during the period |  | $ | (155 | ) |  | $ | — |  |  | $ | 71 |
Less: Net gains and losses recognized during the period on securities sold |  |  | — |  |  |  | (5 | ) |  |  | 9 |
Unrealized gains and losses recognized during the reporting period on securities still held at the reporting date |  | $ | (155 | ) |  | $ | 5 |  |  | $ | 62 |

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