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Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | March 31 , 201 7 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 97,003 |  |  | $ | 434 |  |  | $ | (938 | ) |  | $ | 96,499 |
Commercial |  |  | 77,606 |  |  |  | 51 |  |  |  | (1,156 | ) |  |  | 76,501 |
Obligations of states and political subdivisions |  |  | 7,637 |  |  |  | 395 |  |  |  | (8 | ) |  |  | 8,024 |
Obligations of U.S. government-sponsored agencies |  |  | 2,000 |  |  |  | 4 |  |  |  | — |  |  |  | 2,004 |
Corporate notes |  |  | 750 |  |  |  | — |  |  |  | — |  |  |  | 750 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 185,076 |  |  | $ | 884 |  |  | $ | (2,102 | ) |  | $ | 183,858 |
|  | Held-to-Maturity |
|  | March 31, 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 17,880 |  |  | $ | 7 |  |  | $ | (132 | ) |  | $ | 17,755 |
Obligations of U.S. government-sponsored agencies |  |  | 9,715 |  |  |  | 12 |  |  |  | (152 | ) |  |  | 9,575 |
Obligations of states and political subdivisions |  |  | 2,044 |  |  |  | 6 |  |  |  | (22 | ) |  |  | 2,028 |
Total |  | $ | 29,639 |  |  | $ | 25 |  |  | $ | (306 | ) |  | $ | 29,358 |
|  | 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 |  | $ | 1,089 |  |  | $ | 1,093 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 6,172 |  |  |  | 6,245 |  |  |  | 2,289 |  |  |  | 2,303 |
Maturing after five to ten years |  |  | 82,184 |  |  |  | 81,875 |  |  |  | 2,913 |  |  |  | 2,876 |
Maturing after ten years |  |  | 95,631 |  |  |  | 94,645 |  |  |  | 24,437 |  |  |  | 24,179 |
Total |  | $ | 185,076 |  |  | $ | 183,858 |  |  | $ | 29,639 |  |  | $ | 29,358 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Available-for-Sale |
|  | March 31 , 201 7 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 75,284 |  |  | $ | (917 | ) |  | $ | 1,729 |  |  | $ | (21 | )
Commercial |  |  | 48,106 |  |  |  | (807 | ) |  |  | 18,066 |  |  |  | (349 | )
Obligations of states and political subdivisions |  |  | 847 |  |  |  | (8 | ) |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 124,317 |  |  | $ | (1,732 | ) |  | $ | 19,795 |  |  | $ | (370 | )
|  | Held-to-Maturity |
|  | March 31 , 2017 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 13,030 |  |  | $ | (132 | ) |  | $ | — |  |  | $ | — |
Obligations of U.S. government-sponsored agencies |  |  | 8,618 |  |  |  | (152 | ) |  |  | — |  |  |  | — |
Obligations of states and political subdivisions |  |  | 1,056 |  |  |  | (15 | ) |  |  | 549 |  |  |  | (7 | )
Total |  | $ | 22,704 |  |  | $ | (299 | ) |  | $ | 549 |  |  | $ | (7 | )
|  | Available-for-Sale |
|  | December 31, 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 |  | $ | 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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