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Note 2 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | March 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 3,136 |  |  | $ | 708 |  |  | $ | (40 | ) |  | $ | 3,804 |
|  | 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] |
|  | March 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 2,005 |  |  | $ | 36 |  |  | $ | - |  |  | $ | 2,041 |
U.S. Treasury notes and bonds |  |  | 11,954 |  |  |  | 51 |  |  |  | (141 | ) |  |  | 11,864 |
State and municipal |  |  | 429,772 |  |  |  | 7,209 |  |  |  | (5,506 | ) |  |  | 431,475 |
Mortgage-backed |  |  | 276,592 |  |  |  | 1,495 |  |  |  | (6,164 | ) |  |  | 271,923 |
Corporate |  |  | 1,956 |  |  |  | 34 |  |  |  | - |  |  |  | 1,990 |
Trust preferred securities |  |  | 1,000 |  |  |  | - |  |  |  | - |  |  |  | 1,000 |
Asset-backed securities |  |  | 2,343 |  |  |  | - |  |  |  | (9 | ) |  |  | 2,334 |
Total |  | $ | 725,622 |  |  | $ | 8,825 |  |  | $ | (11,820 | ) |  | $ | 722,627 |
|  | 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 |
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 March 31, |  |  | at Dec. 31, |
(Dollars in thousands) |  | 1 Year |  |  | 5 Years |  |  | 10 Years |  |  | 10 Years |  |  | 2021 |  |  | 2020 |
U.S. Government and federal agency |  | $ | 2,041 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 2,041 |  |  | $ | 2,051 |
U.S. Treasury notes and bonds |  |  | - |  |  |  | 2,048 |  |  |  | 9,816 |  |  |  | - |  |  |  | 11,864 |  |  |  | 2,056 |
State and municipal |  |  | 13,224 |  |  |  | 56,492 |  |  |  | 245,466 |  |  |  | 116,293 |  |  |  | 431,475 |  |  |  | 320,368 |
Corporate |  |  | 958 |  |  |  | 1,032 |  |  |  | - |  |  |  | - |  |  |  | 1,990 |  |  |  | 2,589 |
Trust preferred securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,000 |  |  |  | 1,000 |  |  |  | 1,000 |
Asset-backed securities |  |  | - |  |  |  | 2,334 |  |  |  |  |  |  |  |  |  |  |  | 2,334 |  |  |  | - |
Total debt securities |  |  | 16,223 |  |  |  | 61,906 |  |  |  | 255,282 |  |  |  | 117,293 |  |  |  | 450,704 |  |  |  | 328,064 |
Mortgage-backed securities |  |  | 2,762 |  |  |  | 75,355 |  |  |  | 186,889 |  |  |  | 6,917 |  |  |  | 271,923 |  |  |  | 246,723 |
Equity securities |  |  | - |  |  |  | 1,000 |  |  |  | - |  |  |  | 2,804 |  |  |  | 3,804 |  |  |  | 2,896 |
Total |  | $ | 18,985 |  |  | $ | 138,261 |  |  | $ | 442,171 |  |  | $ | 127,014 |  |  | $ | 726,431 |  |  | $ | 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 |  |  |  | - |  |  |  | - |  |  |  | 1.30 |
State and municipal |  |  | 3.02 |  |  |  | 2.88 |  |  |  | 2.57 |  |  |  | 2.34 |  |  |  | 2.56 |
Corporate |  |  | 2.63 |  |  |  | 2.86 |  |  |  | - |  |  |  | - |  |  |  | 2.75 |
Trust preferred securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 3.75 |
Asset-backed securities |  |  | - |  |  |  | 0.94 |  |  |  | - |  |  |  | - |  |  |  | 0.94 |
Mortgage-backed securities |  |  | 4.94 |  |  |  | 1.81 |  |  |  | 1.09 |  |  |  | 1.73 |  |  |  | 1.35 |
Equity securities |  |  | - |  |  |  | 4.61 |  |  |  | - |  |  |  | - |  |  |  | 1.21 |
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  |  | 2020 |
Net gains and losses recognized during the period |  | $ | 608 |  |  | $ | (389 | )
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 |  | $ | 608 |  |  | $ | (389 | )

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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