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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Marketable Securities [Table Text Block] |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 110,493 |  |  | $ | 93 |  |  | $ | 2,349 |  |  | $ | 108,237 |
Agency CMO |  |  | 16,293 |  |  |  | 23 |  |  |  | 288 |  |  |  | 16,028 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 69,407 |  |  |  | 14 |  |  |  | 759 |  |  |  | 68,662 |
Municipal obligations |  |  | 63,189 |  |  |  | 783 |  |  |  | 1,129 |  |  |  | 62,843 |
Subtotal – debt securities |  |  | 259,382 |  |  |  | 913 |  |  |  | 4,525 |  |  |  | 255,770 |
Mutual funds |  |  | 74 |  |  |  | 0 |  |  |  | 0 |  |  |  | 74 |
Total securities available for sale |  | $ | 259,456 |  |  | $ | 913 |  |  | $ | 4,525 |  |  | $ | 255,844 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 2 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 2 |
Total securities held to maturity |  | $ | 2 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 2 |
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 42,158 |  |  | $ | 123 |  |  | $ | 271 |  |  | $ | 42,010 |
Agency CMO |  |  | 9,391 |  |  |  | 41 |  |  |  | 101 |  |  |  | 9,331 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 84,797 |  |  |  | 11 |  |  |  | 355 |  |  |  | 84,453 |
Municipal obligations |  |  | 49,527 |  |  |  | 1,372 |  |  |  | 60 |  |  |  | 50,839 |
Subtotal – debt securities |  |  | 185,873 |  |  |  | 1,547 |  |  |  | 787 |  |  |  | 186,633 |
Mutual funds |  |  | 118 |  |  |  | 0 |  |  |  | 0 |  |  |  | 118 |
Total securities available for sale |  | $ | 185,991 |  |  | $ | 1,547 |  |  | $ | 787 |  |  | $ | 186,751 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 4 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 4 |
Total securities held to maturity |  | $ | 4 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 4 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available for Sale |  | Securities Held to Maturity
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
(In thousands) |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 3,047 |  |  | $ | 3,049 |  |  | $ | 0 |  |  | $ | 0 |
Due after one year through five years |  |  | 76,481 |  |  |  | 75,767 |  |  |  | 0 |  |  |  | 0 |
Due after five years through ten years |  |  | 18,692 |  |  |  | 18,479 |  |  |  | 0 |  |  |  | 0 |
Due after ten years |  |  | 34,376 |  |  |  | 34,210 |  |  |  | 0 |  |  |  | 0 |
|  |  | 132,596 |  |  |  | 131,505 |  |  |  | 0 |  |  |  | 0 |
Mortgage-backed securities and CMO |  |  | 126,786 |  |  |  | 124,265 |  |  |  | 2 |  |  |  | 2 |
|  | $ | 259,382 |  |  | $ | 255,770 |  |  | $ | 2 |  |  | $ | 2 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
(Dollars in thousands) |  | Number of Investment Positions |  | Fair Value |  | Gross Unrealized Losses
Continuous loss position less than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 78 |  |  | $ | 101,838 |  |  | $ | 2,336 |
Agency CMO |  |  | 13 |  |  |  | 11,767 |  |  |  | 239 |
Agency notes and bonds |  |  | 20 |  |  |  | 59,126 |  |  |  | 759 |
Municipal obligations |  |  | 54 |  |  |  | 28,414 |  |  |  | 1,129 |
Total less than twelve months |  |  | 165 |  |  |  | 201,145 |  |  |  | 4,463 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 1 |  |  |  | 531 |  |  |  | 13 |
Agency CMO |  |  | 5 |  |  |  | 2,502 |  |  |  | 49 |
Total more than twelve months |  |  | 6 |  |  |  | 3,033 |  |  |  | 62 |
Total securities available for sale |  |  | 171 |  |  | $ | 204,178 |  |  | $ | 4,525 |

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