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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | June 30, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 7,856 |  |  | $ | 587 |  |  | $ | (38 | ) |  | $ | 8,405 |
|  | December 31, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 2,836 |  |  | $ | 60 |  |  | $ | - |  |  | $ | 2,896 |
Debt Securities, Available-for-sale [Table Text Block] |
|  | June 30, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 2,004 |  |  | $ | 26 |  |  | $ | - |  |  | $ | 2,030 |
U.S. Treasury notes and bonds |  |  | 37,195 |  |  |  | 166 |  |  |  | - |  |  |  | 37,361 |
State and municipal |  |  | 476,698 |  |  |  | 12,657 |  |  |  | (1,914 | ) |  |  | 487,441 |
Mortgage-backed |  |  | 320,612 |  |  |  | 1,596 |  |  |  | (3,895 | ) |  |  | 318,313 |
Corporate |  |  | 8,303 |  |  |  | 39 |  |  |  | - |  |  |  | 8,342 |
Asset-backed securities |  |  | 2,077 |  |  |  | - |  |  |  | (9 | ) |  |  | 2,068 |
Total |  | $ | 846,889 |  |  | $ | 14,484 |  |  | $ | (5,818 | ) |  | $ | 855,555 |
|  | 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 |  |  | 3,539 |  |  |  | 51 |  |  |  | (1 | ) |  |  | 3,589 |
Total |  | $ | 560,828 |  |  | $ | 14,856 |  |  | $ | (897 | ) |  | $ | 574,787 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities maturing within: |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value |  |  | Fair Value |
|  | Less than |  |  | 1 Year - |  |  | 5 Years - |  |  | More than |  |  | at June 30, |  |  | at Dec. 31, |
(Dollars in thousands) |  | 1 Year |  |  | 5 Years |  |  | 10 Years |  |  | 10 Years |  |  | 2021 |  |  | 2020 |
U.S. Government and federal agency |  | $ | 2,030 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 2,030 |  |  | $ | 2,051 |
U.S. Treasury notes and bonds |  |  | - |  |  |  | 2,040 |  |  |  | 35,321 |  |  |  | - |  |  |  | 37,361 |  |  |  | 2,056 |
State and municipal |  |  | 14,546 |  |  |  | 59,291 |  |  |  | 317,995 |  |  |  | 95,609 |  |  |  | 487,441 |  |  |  | 320,368 |
Corporate |  |  | 502 |  |  |  | 1,040 |  |  |  | 5,800 |  |  |  | 1,000 |  |  |  | 8,342 |  |  |  | 3,589 |
Asset-backed securities |  |  | - |  |  |  | 2,068 |  |  |  | - |  |  |  | - |  |  |  | 2,068 |  |  |  | - |
Total debt securities |  |  | 17,078 |  |  |  | 64,439 |  |  |  | 359,116 |  |  |  | 96,609 |  |  |  | 537,242 |  |  |  | 328,064 |
Mortgage-backed securities |  |  | 12,924 |  |  |  | 97,585 |  |  |  | 200,623 |  |  |  | 7,181 |  |  |  | 318,313 |  |  |  | 246,723 |
Equity securities |  |  | - |  |  |  | 1,000 |  |  |  | - |  |  |  | 7,405 |  |  |  | 8,405 |  |  |  | 2,896 |
Total |  | $ | 30,002 |  |  | $ | 163,024 |  |  | $ | 559,739 |  |  | $ | 111,195 |  |  | $ | 863,960 |  |  | $ | 577,683 |
|  | Weighted average yields: |
|  | Less than |  |  | 1 Year - |  |  | 5 Years - |  |  | More than |  |  |  |  |
|  | 1 Year |  |  | 5 Years |  |  | 10 Years |  |  | 10 Years |  |  | Total |
U.S. Government and federal agency |  |  | 1.98 | % |  |  | - | % |  |  | - | % |  |  | - | % |  |  | 1.98 | %
U.S. Treasury notes and bonds |  |  | - |  |  |  | 1.85 |  |  |  | 1.24 |  |  |  | - |  |  |  | 1.27 |
State and municipal |  |  | 3.12 |  |  |  | 2.88 |  |  |  | 2.51 |  |  |  | 2.33 |  |  |  | 2.54 |
Corporate |  |  | 2.57 |  |  |  | 2.86 |  |  |  | 3.70 |  |  |  | 3.75 |  |  |  | 3.75 |
Asset-backed securities |  |  | - |  |  |  | 0.94 |  |  |  | - |  |  |  | - |  |  |  | 0.94 |
Mortgage-backed securities |  |  | 1.78 |  |  |  | 1.83 |  |  |  | 1.26 |  |  |  | 1.74 |  |  |  | 1.47 |
Equity securities |  |  | - |  |  |  | 4.66 |  |  |  | - |  |  |  | - |  |  |  | 0.55 |
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net gains and (losses) recognized during the period |  | $ | (119 | ) |  | $ | 443 |  |  | $ | 489 |  |  | $ | 54 |
Less: Net gains and (losses) recognized during the period on securities sold |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unrealized gains and losses recognized during the reporting period on securities still held at the reporting date |  | $ | (119 | ) |  | $ | 443 |  |  | $ | 489 |  |  | $ | 54 |

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