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Note 2 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | September 30, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 7,898 |  |  | $ | 600 |  |  | $ | (79 | ) |  | $ | 8,419 |
|  | 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] |
|  | September 30, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 2,002 |  |  | $ | 18 |  |  | $ | - |  |  | $ | 2,020 |
U.S. Treasury notes and bonds |  |  | 93,381 |  |  |  | 58 |  |  |  | (653 | ) |  |  | 92,786 |
State and municipal |  |  | 488,858 |  |  |  | 10,584 |  |  |  | (2,704 | ) |  |  | 496,738 |
Mortgage-backed |  |  | 411,376 |  |  |  | 1,207 |  |  |  | (5,887 | ) |  |  | 406,696 |
Corporate |  |  | 13,107 |  |  |  | 31 |  |  |  | (125 | ) |  |  | 13,013 |
Asset-backed securities |  |  | 16,897 |  |  |  | 3 |  |  |  | (38 | ) |  |  | 16,862 |
Total |  | $ | 1,025,621 |  |  | $ | 11,901 |  |  | $ | (9,407 | ) |  | $ | 1,028,115 |
|  | 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 |  |  |  |
|  | Less than |  |  | 1 Year - |  |  | 5 Years - |  |  | More than |  |  | at September 30, |  |  | Fair Value at Dec. 31, |
(Dollars in thousands) |  | 1 Year |  |  | 5 Years |  |  | 10 Years |  |  | 10 Years |  |  | 2021 |  |  | 2020 |
U.S. Government and federal agency |  | $ | 2,020 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 2,020 |  |  | $ | 2,051 |
U.S. Treasury notes and bonds |  |  | 2,033 |  |  |  | - |  |  |  | 90,753 |  |  |  | - |  |  |  | 92,786 |  |  |  | 2,056 |
State and municipal |  |  | 18,807 |  |  |  | 58,342 |  |  |  | 337,206 |  |  |  | 82,383 |  |  |  | 496,738 |  |  |  | 320,368 |
Corporate |  |  | 507 |  |  |  | 828 |  |  |  | 10,678 |  |  |  | 1,000 |  |  |  | 13,013 |  |  |  | 3,589 |
Asset-backed securities |  |  | - |  |  |  | 12,691 |  |  |  | 4,171 |  |  |  | - |  |  |  | 16,862 |  |  |  | - |
Total debt securities |  |  | 23,367 |  |  |  | 71,861 |  |  |  | 442,808 |  |  |  | 83,383 |  |  |  | 621,419 |  |  |  | 328,064 |
Mortgage-backed securities |  |  | 17,061 |  |  |  | 148,397 |  |  |  | 240,579 |  |  |  | 659 |  |  |  | 406,696 |  |  |  | 246,723 |
Equity securities |  |  | - |  |  |  | 1,000 |  |  |  | - |  |  |  | 7,419 |  |  |  | 8,419 |  |  |  | 2,896 |
Total |  | $ | 40,428 |  |  | $ | 221,258 |  |  | $ | 683,387 |  |  | $ | 91,461 |  |  | $ | 1,036,534 |  |  | $ | 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 |  |  |  | - |  |  |  | 1.16 |  |  |  | - |  |  |  | 1.18 |
State and municipal |  |  | 2.80 |  |  |  | 2.86 |  |  |  | 2.50 |  |  |  | 2.33 |  |  |  | 2.52 |
Corporate |  |  | 2.50 |  |  |  | 3.50 |  |  |  | 2.80 |  |  |  | 3.75 |  |  |  | 2.90 |
Asset-backed securities |  |  | - |  |  |  | 0.64 |  |  |  | 0.76 |  |  |  | - |  |  |  | 0.67 |
Mortgage-backed securities |  |  | 1.69 |  |  |  | 1.58 |  |  |  | 1.38 |  |  |  | 2.90 |  |  |  | 1.47 |
Equity securities |  |  | - |  |  |  | 3.69 |  |  |  | - |  |  |  | - |  |  |  | 0.44 |
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net gains and (losses) recognized during the period |  | $ | (28 | ) |  | $ | (238 | ) |  | $ | 461 |  |  | $ | (184 | )
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 |  | $ | (28 | ) |  | $ | (238 | ) |  | $ | 461 |  |  | $ | (184 | )

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