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Note 3 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | September 30 , 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 83,391 |  |  | $ | 477 |  |  | $ | (318 | ) |  | $ | 83,550 |
Commercial |  |  | 67,781 |  |  |  | 62 |  |  |  | (705 | ) |  |  | 67,138 |
Obligations of states and political subdivisions |  |  | 5,424 |  |  |  | 231 |  |  |  | — |  |  |  | 5,655 |
Obligations of U.S. government-sponsored agencies |  |  | 2,000 |  |  |  | 2 |  |  |  | — |  |  |  | 2,002 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 158,676 |  |  | $ | 772 |  |  | $ | (1,023 | ) |  | $ | 158,425 |
|  | Held-to-Maturity |
|  | September 30 , 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 15,976 |  |  | $ | 18 |  |  | $ | (61 | ) |  | $ | 15,933 |
Obligations of U.S. government-sponsored agencies |  |  | 9,458 |  |  |  | 25 |  |  |  | (79 | ) |  |  | 9,404 |
Obligations of states and political subdivisions |  |  | 1,943 |  |  |  | 26 |  |  |  | (3 | ) |  |  | 1,966 |
Total |  | $ | 27,377 |  |  | $ | 69 |  |  | $ | (143 | ) |  | $ | 27,303 |
|  | Available-for-Sale |
|  | December 31, 2016 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 99,922 |  |  | $ | 490 |  |  | $ | (2,003 | ) |  | $ | 98,409 |
Commercial |  |  | 71,761 |  |  |  | 56 |  |  |  | (1,287 | ) |  |  | 70,530 |
Obligations of states and political subdivisions |  |  | 9,759 |  |  |  | 390 |  |  |  | (7 | ) |  |  | 10,142 |
Obligations of U.S. government-sponsored agencies |  |  | 2,000 |  |  |  | — |  |  |  | (7 | ) |  |  | 1,993 |
Corporate notes |  |  | 756 |  |  |  | — |  |  |  | — |  |  |  | 756 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 184,278 |  |  | $ | 936 |  |  | $ | (3,304 | ) |  | $ | 181,910 |
|  | Held-to-Maturity |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 14,684 |  |  | $ | 5 |  |  | $ | (148 | ) |  | $ | 14,541 |
Obligations of U.S. government-sponsored agencies |  |  | 9,129 |  |  |  | 13 |  |  |  | (222 | ) |  |  | 8,920 |
Obligations of states and political subdivisions |  |  | 2,091 |  |  |  | 2 |  |  |  | (46 | ) |  |  | 2,047 |
Total |  | $ | 25,904 |  |  | $ | 20 |  |  | $ | (416 | ) |  | $ | 25,508 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Available-for-Sale |  |  | Held-to-Maturity |
|  | Amortized Cost |  |  | Estimated Fair Value |  |  | Amortized Cost |  |  | Estimated Fair Value |
|  | (Dollars in Thousands) |
Maturing within one year |  | $ | 490 |  |  | $ | 496 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 8,674 |  |  |  | 8,723 |  |  |  | 2,048 |  |  |  | 2,079 |
Maturing after five to ten years |  |  | 71,462 |  |  |  | 71,596 |  |  |  | 2,904 |  |  |  | 2,899 |
Maturing after ten years |  |  | 78,050 |  |  |  | 77,610 |  |  |  | 22,425 |  |  |  | 22,325 |
Total |  | $ | 158,676 |  |  | $ | 158,425 |  |  | $ | 27,377 |  |  | $ | 27,303 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Available-for-Sale |
|  | September 30 , 2017 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 38,784 |  |  | $ | (115 | ) |  | $ | 14,350 |  |  | $ | (203 | )
Commercial |  |  | 19,576 |  |  |  | (145 | ) |  |  | 37,291 |  |  |  | (560 | )
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 58,440 |  |  | $ | (260 | ) |  | $ | 51,641 |  |  | $ | (763 | )
|  | Held-to-Maturity |
|  | September 30 , 2017 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |
Commercial |  | $ | 9,643 |  |  | $ | (58 | ) |  | $ | 423 |  |  | $ | (3 | )
Obligations of U.S. government-sponsored agencies |  |  | 3,217 |  |  |  | (27 | ) |  |  | 4,345 |  |  |  | (52 | )
Obligations of states and political subdivisions |  |  | — |  |  |  | — |  |  |  | 543 |  |  |  | (3 | )
Total |  | $ | 12,860 |  |  | $ | (85 | ) |  | $ | 5,311 |  |  | $ | (58 | )
|  | Available-for-Sale |
|  | December 31, 2016 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 85,741 |  |  | $ | (1,976 | ) |  | $ | 1,904 |  |  | $ | (27 | )
Commercial |  |  | 54,475 |  |  |  | (946 | ) |  |  | 10,721 |  |  |  | (341 | )
Obligations of U.S. government-sponsored agencies |  |  | 1,993 |  |  |  | (7 | ) |  |  | — |  |  |  | — |
Obligations of states and political subdivisions |  |  | 434 |  |  |  | (7 | ) |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 142,723 |  |  | $ | (2,936 | ) |  | $ | 12,625 |  |  | $ | (368 | )
|  | Held-to-Maturity |
|  | December 31, 2016 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 12,776 |  |  | $ | (148 | ) |  | $ | — |  |  | $ | — |
Obligations of U.S. government-sponsored agencies |  |  | 7,957 |  |  |  | (222 | ) |  |  | — |  |  |  | — |
Obligations of states and political subdivisions |  |  | 1,628 |  |  |  | (46 | ) |  |  | — |  |  |  | — |
Total |  | $ | 22,361 |  |  | $ | (416 | ) |  | $ | — |  |  | $ | — |

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