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Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | March 31 , 201 8 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 87,463 |  |  | $ | 202 |  |  | $ | (1,983 | ) |  | $ | 85,682 |
Commercial |  |  | 67,846 |  |  |  | 16 |  |  |  | (1,868 | ) |  |  | 65,994 |
Obligations of states and political subdivisions |  |  | 4,749 |  |  |  | 140 |  |  |  | (3 | ) |  |  | 4,886 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 160,138 |  |  | $ | 358 |  |  | $ | (3,854 | ) |  | $ | 156,642 |
|  | Held-to-Maturity |
|  | March 31, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 14,237 |  |  | $ | — |  |  | $ | (342 | ) |  | $ | 13,895 |
Obligations of U.S. government-sponsored agencies |  |  | 9,209 |  |  |  | — |  |  |  | (255 | ) |  |  | 8,954 |
Obligations of states and political subdivisions |  |  | 1,854 |  |  |  | — |  |  |  | (16 | ) |  |  | 1,838 |
Total |  | $ | 25,300 |  |  | $ | — |  |  | $ | (613 | ) |  | $ | 24,687 |
|  | Available-for-Sale |
|  | December 31, 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 83,360 |  |  | $ | 286 |  |  | $ | (860 | ) |  | $ | 82,786 |
Commercial |  |  | 67,281 |  |  |  | 27 |  |  |  | (1,234 | ) |  |  | 66,074 |
Obligations of states and political subdivisions |  |  | 4,752 |  |  |  | 182 |  |  |  | (3 | ) |  |  | 4,931 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 155,473 |  |  | $ | 495 |  |  | $ | (2,097 | ) |  | $ | 153,871 |
|  | Held-to-Maturity |
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 15,065 |  |  | $ | 1 |  |  | $ | (186 | ) |  | $ | 14,880 |
Obligations of U.S. government-sponsored agencies |  |  | 9,326 |  |  |  | 7 |  |  |  | (144 | ) |  |  | 9,189 |
Obligations of states and political subdivisions |  |  | 1,888 |  |  |  | 5 |  |  |  | (13 | ) |  |  | 1,880 |
Total |  | $ | 26,279 |  |  | $ | 13 |  |  | $ | (343 | ) |  | $ | 25,949 |
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 |  | $ | 699 |  |  | $ | 707 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 22,234 |  |  |  | 21,719 |  |  |  | 1,827 |  |  |  | 1,813 |
Maturing after five to ten years |  |  | 80,332 |  |  |  | 78,419 |  |  |  | 4,293 |  |  |  | 4,217 |
Maturing after ten years |  |  | 56,873 |  |  |  | 55,797 |  |  |  | 19,180 |  |  |  | 18,657 |
Total |  | $ | 160,138 |  |  | $ | 156,642 |  |  | $ | 25,300 |  |  | $ | 24,687 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Available-for-Sale |
|  | March 31 , 201 8 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 56,885 |  |  | $ | (1,209 | ) |  | $ | 21,126 |  |  | $ | (774 | )
Commercial |  |  | 20,155 |  |  |  | (398 | ) |  |  | 44,735 |  |  |  | (1,470 | )
Obligations of states and political subdivisions |  |  | 426 |  |  |  | (3 | ) |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 77,546 |  |  | $ | (1,610 | ) |  | $ | 65,861 |  |  | $ | (2,244 | )
|  | Held-to-Maturity |
|  | March 31 , 2018 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 7,642 |  |  | $ | (150 | ) |  | $ | 6,253 |  |  | $ | (192 | )
Obligations of U.S. government-sponsored agencies |  |  | 1,656 |  |  |  | (23 | ) |  |  | 7,298 |  |  |  | (232 | )
Obligations of states and political subdivisions |  |  | 1,311 |  |  |  | (8 | ) |  |  | 527 |  |  |  | (8 | )
Total |  | $ | 10,609 |  |  | $ | (181 | ) |  | $ | 14,078 |  |  | $ | (432 | )
|  | Available-for-Sale |
|  | December 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 |  | $ | 47,007 |  |  | $ | (467 | ) |  | $ | 21,122 |  |  | $ | (393 | )
Commercial |  |  | 18,554 |  |  |  | (180 | ) |  |  | 46,312 |  |  |  | (1,054 | )
Obligations of states and political subdivisions |  |  | 428 |  |  |  | (3 | ) |  |  | — |  |  |  | — |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 66,069 |  |  | $ | (650 | ) |  | $ | 67,434 |  |  | $ | (1,447 | )
|  | Held-to-Maturity |
|  | December 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 |  | $ | 7,895 |  |  | $ | (63 | ) |  | $ | 6,675 |  |  | $ | (123 | )
Obligations of U.S. government-sponsored agencies |  |  | 865 |  |  |  | (2 | ) |  |  | 7,388 |  |  |  | (142 | )
Obligations of states and political subdivisions |  |  | 571 |  |  |  | (3 | ) |  |  | 531 |  |  |  | (10 | )
Total |  | $ | 9,331 |  |  | $ | (68 | ) |  | $ | 14,594 |  |  | $ | (275 | )

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