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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair 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 |
|  | Available-for-Sale |
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 135,104 |  |  | $ | 998 |  |  | $ | (608 | ) |  | $ | 135,494 |
Commercial |  |  | 45,961 |  |  |  | 164 |  |  |  | (616 | ) |  |  | 45,509 |
Obligations of states and political subdivisions |  |  | 14,071 |  |  |  | 931 |  |  |  | (4 | ) |  |  | 14,998 |
Obligations of U.S. government-sponsored agencies |  |  | 1,999 |  |  |  | — |  |  |  | (17 | ) |  |  | 1,982 |
Corporate notes |  |  | 780 |  |  |  | — |  |  |  | — |  |  |  | 780 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 197,995 |  |  | $ | 2,093 |  |  | $ | (1,245 | ) |  | $ | 198,843 |
|  | Held-to-Maturity |
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dol lars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 16,321 |  |  | $ | 33 |  |  | $ | (170 | ) |  | $ | 16,184 |
Obligations of U.S. government-sponsored agencies |  |  | 13,766 |  |  |  | 19 |  |  |  | (71 | ) |  |  | 13,714 |
Obligations of states and political subdivisions |  |  | 2,272 |  |  |  | 18 |  |  |  | (4 | ) |  |  | 2,286 |
Total |  | $ | 32,359 |  |  | $ | 70 |  |  | $ | (245 | ) |  | $ | 32,184 |
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 |  | $ | 1,921 |  |  | $ | 1,929 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 4,654 |  |  |  | 4,705 |  |  |  | 1,986 |  |  |  | 1,995 |
Maturing after five to ten years |  |  | 83,901 |  |  |  | 82,804 |  |  |  | 3,335 |  |  |  | 3,268 |
Maturing after ten years |  |  | 93,802 |  |  |  | 92,472 |  |  |  | 20,583 |  |  |  | 20,245 |
Total |  | $ | 184,278 |  |  | $ | 181,910 |  |  | $ | 25,904 |  |  | $ | 25,508 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | 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 | ) |  | $ | — |  |  | $ | — |
|  | Available-for-Sale |
|  | December 31, 2015 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 83,403 |  |  | $ | (458 | ) |  | $ | 9,061 |  |  | $ | (150 | )
Commercial |  |  | 24,337 |  |  |  | (272 | ) |  |  | 8,918 |  |  |  | (344 | )
Obligations of U.S. government-sponsored agencies |  |  | 1,982 |  |  |  | (17 | ) |  |  | — |  |  |  | — |
Corporate notes |  |  | 779 |  |  |  | — |  |  |  | — |  |  |  | — |
Obligations of states and political subdivisions |  |  | 707 |  |  |  | (4 | ) |  |  | — |  |  |  | — |
Total |  | $ | 111,208 |  |  | $ | (751 | ) |  | $ | 17,979 |  |  | $ | (494 | )
|  | Held-to-Maturity |
|  | December 31, 2015 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |
Commercial |  | $ | 14,143 |  |  | $ | (170 | ) |  | $ | — |  |  | $ | — |
Obligations of U.S. government-sponsored agencies |  |  | 11,163 |  |  |  | (44 | ) |  |  | 1,560 |  |  |  | (27 | )
Obligations of states and political subdivisions |  |  | 572 |  |  |  | (4 | ) |  |  | — |  |  |  | — |
Total |  | $ | 25,878 |  |  | $ | (218 | ) |  | $ | 1,560 |  |  | $ | (27 | )

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