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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Marketable Securities [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 59,997 |  |  | $ | 1,362 |  |  | $ | - |  |  | $ | 61,359 |
Agency CMO |  |  | 20,842 |  |  |  | 218 |  |  |  | 30 |  |  |  | 21,030 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 80,359 |  |  |  | 1,175 |  |  |  | 3 |  |  |  | 81,531 |
Municipal obligations |  |  | 113,511 |  |  |  | 6,075 |  |  |  | 4 |  |  |  | 119,582 |
Total securities available for sale |  | $ | 274,709 |  |  | $ | 8,830 |  |  | $ | 37 |  |  | $ | 283,502 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 69,984 |  |  | $ | 90 |  |  | $ | 576 |  |  | $ | 69,498 |
Agency CMO |  |  | 43,067 |  |  |  | 238 |  |  |  | 221 |  |  |  | 43,084 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 64,162 |  |  |  | 473 |  |  |  | 79 |  |  |  | 64,556 |
Municipal obligations |  |  | 74,606 |  |  |  | 2,843 |  |  |  | 25 |  |  |  | 77,424 |
Total securities available for sale |  | $ | 251,819 |  |  | $ | 3,644 |  |  | $ | 901 |  |  | $ | 254,562 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available for Sale |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
(In thousands) |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 20,593 |  |  | $ | 20,703 |
Due after one year through five years |  |  | 68,776 |  |  |  | 70,110 |
Due after five years through ten years |  |  | 37,626 |  |  |  | 39,864 |
Due after ten years |  |  | 66,875 |  |  |  | 70,436 |
|  |  | 193,870 |  |  |  | 201,113 |
Mortgage-backed securities and |  |  |  |  |  |  |  |
CMO |  |  | 80,839 |  |  |  | 82,389 |
|  | $ | 274,709 |  |  | $ | 283,502 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Number of |  |  |  |  |  |  | Gross |
|  | Investment |  |  | Fair |  |  | Unrealized |
(Dollars in thousands) |  | Positions |  |  | Value |  |  | Losses |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Continuous loss position less than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency CMO |  |  | 12 |  |  | $ | 6,189 |  |  | $ | 18 |
Agency notes and bonds |  |  | 2 |  |  |  | 5,997 |  |  |  | 3 |
Municipal obligations |  |  | 2 |  |  |  | 1,303 |  |  |  | 4 |
Total less than twelve months |  |  | 16 |  |  |  | 13,489 |  |  |  | 25 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency CMO |  |  | 4 |  |  |  | 1,589 |  |  |  | 12 |
Total more than twelve months |  |  | 4 |  |  |  | 1,589 |  |  |  | 12 |
Total securities available for sale |  |  | 20 |  |  | $ | 15,078 |  |  | $ | 37 |
|  | Number of |  |  |  |  |  | Gross |
|  | Investment |  |  | Fair |  |  | Unrealized |
(Dollars in thousands) |  | Positions |  |  | Value |  |  | Losses |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |
Continuous loss position less than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 5 |  |  | $ | 723 |  |  | $ | 2 |
Agency CMO |  |  | 13 |  |  |  | 14,749 |  |  |  | 157 |
Agency notes and bonds |  |  | 2 |  |  |  | 5,551 |  |  |  | 17 |
Municipal obligations |  |  | 4 |  |  |  | 3,241 |  |  |  | 25 |
Total less than twelve months |  |  | 24 |  |  |  | 24,264 |  |  |  | 201 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 50 |  |  |  | 49,033 |  |  |  | 574 |
Agency CMO |  |  | 15 |  |  |  | 7,113 |  |  |  | 64 |
Agency notes and bonds |  |  | 10 |  |  |  | 37,706 |  |  |  | 62 |
Total more than twelve months |  |  | 75 |  |  |  | 93,852 |  |  |  | 700 |
Total securities available for sale |  |  | 99 |  |  | $ | 118,116 |  |  | $ | 901 |

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