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Note 2 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | December 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Equity securities |  | $ | 7,953 |  |  | $ | 665 |  |  | $ | (126 | ) |  | $ | 8,492 |
|  | 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] |
|  | December 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Government and federal agency |  | $ | 2,001 |  |  | $ | 7 |  |  | $ | - |  |  | $ | 2,008 |
U.S. Treasury notes and bonds |  |  | 93,267 |  |  |  | 23 |  |  |  | (1,311 | ) |  |  | 91,979 |
State and municipal |  |  | 528,252 |  |  |  | 10,704 |  |  |  | (4,109 | ) |  |  | 534,847 |
Mortgage-backed |  |  | 441,383 |  |  |  | 781 |  |  |  | (9,049 | ) |  |  | 433,115 |
Corporate |  |  | 20,856 |  |  |  | 19 |  |  |  | (233 | ) |  |  | 20,642 |
Asset-backed securities |  |  | 16,387 |  |  |  | - |  |  |  | (93 | ) |  |  | 16,294 |
Total |  | $ | 1,102,146 |  |  | $ | 11,534 |  |  | $ | (14,795 | ) |  | $ | 1,098,885 |
|  | 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 |
Schedule of Realized Gain (Loss) [Table Text Block] |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Proceeds from sales of securities |  | $ | 29,742 |  |  | $ | 121,942 |  |  | $ | 178,913 |
Gross realized gains |  |  | 0 |  |  |  | 1,308 |  |  |  | 22 |
Gross realized losses |  |  | (40 | ) |  |  | - |  |  |  | - |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(Dollars in thousands) |  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due within one year |  | $ | 25,111 |  |  | $ | 25,310 |
Due after one year through five years |  |  | 49,146 |  |  |  | 50,979 |
Due after five years through ten years |  |  | 474,166 |  |  |  | 480,614 |
Due after ten years |  |  | 112,340 |  |  |  | 108,867 |
Total debt securities |  |  | 660,763 |  |  |  | 665,770 |
Mortgage-backed securities |  |  | 441,383 |  |  |  | 433,115 |
Equity securities |  |  | 7,953 |  |  |  | 8,492 |
Total |  | $ | 1,110,099 |  |  | $ | 1,107,377 |
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] |
(Dollars in thousands) |  | 2021 |  |  | 2020 |
Securities pledged for Community Reinvestment Act credits |  | $ | 273 |  |  | $ | 278 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | 2021 |
|  | 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 |  |  | 89,958 |  |  |  | 1,311 |  |  |  | - |  |  |  | - |  |  |  | 89,958 |  |  |  | 1,311 |
State and municipal |  |  | 130,001 |  |  |  | 3,253 |  |  |  | 15,237 |  |  |  | 856 |  |  |  | 145,238 |  |  |  | 4,109 |
Mortgage-backed |  |  | 261,560 |  |  |  | 5,709 |  |  |  | 86,974 |  |  |  | 3,340 |  |  |  | 348,534 |  |  |  | 9,049 |
Corporate |  |  | 17,369 |  |  |  | 233 |  |  |  | - |  |  |  | - |  |  |  | 17,369 |  |  |  | 233 |
Asset-backed securities |  |  | 16,294 |  |  |  | 93 |  |  |  | - |  |  |  | - |  |  |  | 16,294 |  |  |  | 93 |
Total temporarily impaired |  | $ | 515,182 |  |  | $ | 10,599 |  |  | $ | 102,211 |  |  | $ | 4,196 |  |  | $ | 617,393 |  |  | $ | 14,795 |
|  | 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 |
Asset-backed securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total temporarily impaired |  | $ | 84,529 |  |  | $ | 891 |  |  | $ | 9,994 |  |  | $ | 6 |  |  | $ | 94,523 |  |  | $ | 897 |
Gain (Loss) on Securities [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net gains and losses recognized during the period |  | $ | 479 |  |  | $ | (155 | ) |  | $ | - |
Less: Net gains and losses recognized during the period on securities sold |  |  | - |  |  |  | - |  |  |  | (5 | )
Unrealized gains and losses recognized during the reporting period on securities still held at the reporting date |  | $ | 479 |  |  | $ | (155 | ) |  | $ | 5 |

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