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Note 5 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | June 30 , 201 6 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 110,687 |  |  | $ | 1,849 |  |  | $ | (20 | ) |  | $ | 112,516 |
Commercial |  |  | 53,472 |  |  |  | 295 |  |  |  | (456 | ) |  |  | 53,311 |
Obligations of states and political subdivisions |  |  | 10,267 |  |  |  | 662 |  |  |  | — |  |  |  | 10,929 |
Obligations of U.S. government-sponsored agencies |  |  | 2,000 |  |  |  | 8 |  |  |  | — |  |  |  | 2,008 |
Corporate notes |  |  | 767 |  |  |  | 2 |  |  |  | — |  |  |  | 769 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 177,273 |  |  | $ | 2,816 |  |  | $ | (476 | ) |  | $ | 179,613 |
|  | Held-to-Maturity |
|  | June 30 , 201 6 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 17,396 |  |  | $ | 105 |  |  | $ | — |  |  | $ | 17,501 |
Obligations of U.S. government-sponsored agencies |  |  | 13,972 |  |  |  | 77 |  |  |  | (2 | ) |  |  | 14,047 |
Obligations of states and political subdivisions |  |  | 2,184 |  |  |  | 40 |  |  |  | (3 | ) |  |  | 2,221 |
Total |  | $ | 33,552 |  |  | $ | 222 |  |  | $ | (5 | ) |  | $ | 33,769 |
|  | Available-for-Sale |
|  | December 31, 201 5 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | 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, 201 5 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars 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 |  | $ | 1,930 |  |  | $ | 1,947 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 6,124 |  |  |  | 6,256 |  |  |  | 1,463 |  |  |  | 1,509 |
Maturing after five to ten years |  |  | 94,262 |  |  |  | 95,782 |  |  |  | 9,653 |  |  |  | 9,674 |
Maturing after ten years |  |  | 74,957 |  |  |  | 75,628 |  |  |  | 22,436 |  |  |  | 22,586 |
Total |  | $ | 177,273 |  |  | $ | 179,613 |  |  | $ | 33,552 |  |  | $ | 33,769 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Available-for-Sale |
|  | June 30 , 201 6 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,646 |  |  | $ | (2 | ) |  | $ | 2,099 |  |  | $ | (441 | )
Commercial |  |  | 13,893 |  |  |  | (15 | ) |  |  | 13,612 |  |  |  | (18 | )
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 15,619 |  |  | $ | (17 | ) |  | $ | 15,711 |  |  | $ | (459 | )
|  | Held-to-Maturity |
|  | June 30 , 201 6 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Obligations of U.S. government-sponsored agencies |  | $ | 1,396 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | — |
Obligations of states and political subdivisions |  |  | 568 |  |  |  | (3 | ) |  |  | — |  |  |  | — |
Total |  | $ | 1,964 |  |  | $ | (5 | ) |  | $ | — |  |  | $ | — |
|  | Available-for-Sale |
|  | December 31, 201 5 |
|  | 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, 201 5 |
|  | 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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