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Note 2 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Marketable Securities [Table Text Block] |
|  |  |  | Gross |  | Gross |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 120,676 |  |  | $ | 54 |  |  | $ | 1,233 |  |  | $ | 119,497 |
Agency CMO |  |  | 14,623 |  |  |  | 7 |  |  |  | 177 |  |  |  | 14,453 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 71,457 |  |  |  | 3 |  |  |  | 437 |  |  |  | 71,023 |
Municipal obligations |  |  | 70,395 |  |  |  | 1,652 |  |  |  | 282 |  |  |  | 71,765 |
Subtotal - debt securities |  |  | 277,151 |  |  |  | 1,716 |  |  |  | 2,129 |  |  |  | 276,738 |
Mutual funds |  |  | 424 |  |  |  | 0 |  |  |  | 0 |  |  |  | 424 |
Total securities available for sale |  | $ | 277,575 |  |  | $ | 1,716 |  |  | $ | 2,129 |  |  | $ | 277,162 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 2 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 2 |
Total securities held to maturity |  | $ | 2 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 2 |
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 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available for Sale |  | Securities Held to Maturity
|  | Amortized |  | Fair |  | Amortized |  | Fair
|  | Cost |  | Value |  | Cost |  | Value
(In thousands) |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 1,992 |  |  | $ | 1,992 |  |  | $ | 0 |  |  | $ | 0 |
Due after one year through five years |  |  | 75,703 |  |  |  | 75,373 |  |  |  | 0 |  |  |  | 0 |
Due after five years through ten years |  |  | 20,555 |  |  |  | 20,890 |  |  |  |  |  |  |  |  |
Due after ten years |  |  | 43,602 |  |  |  | 44,533 |  |  |  | 0 |  |  |  | 0 |
|  |  | 141,852 |  |  |  | 142,788 |  |  |  | 0 |  |  |  | 0 |
Mortgage-backed securities and CMO |  |  | 135,299 |  |  |  | 133,950 |  |  |  | 2 |  |  |  | 2 |
|  | $ | 277,151 |  |  | $ | 276,738 |  |  | $ | 2 |  |  | $ | 2 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Number of |  |  |  | Gross
|  | Investment |  | Fair |  | Unrealized
|  | Positions |  | Value |  | Losses
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Continuous loss position less than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 18 |  |  | $ | 50,419 |  |  | $ | 242 |
Agency CMO |  |  | 9 |  |  |  | 7,385 |  |  |  | 79 |
Agency mortgage-backed securities |  |  | 69 |  |  |  | 91,621 |  |  |  | 1,070 |
Muncipal obligations |  |  | 25 |  |  |  | 13,713 |  |  |  | 234 |
Total less than twelve months |  |  | 121 |  |  |  | 163,138 |  |  |  | 1,625 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 5 |  |  | $ | 18,805 |  |  | $ | 195 |
Agency CMO |  |  | 9 |  |  |  | 5,735 |  |  |  | 98 |
Agency mortgage-backed securities |  |  | 5 |  |  |  | 9,930 |  |  |  | 163 |
Muncipal obligations |  |  | 6 |  |  |  | 2,435 |  |  |  | 48 |
Total more than twelve months |  |  | 25 |  |  |  | 36,905 |  |  |  | 504 |
Total securities available for sale |  |  | 146 |  |  | $ | 200,043 |  |  | $ | 2,129 |

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