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Note 4 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block] |
|  | Available-for-Sale |
|  | September 30 , 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 76,064 |  |  | $ | 144 |  |  | $ | (1,897 | ) |  | $ | 74,311 |
Commercial |  |  | 59,796 |  |  |  | 11 |  |  |  | (2,091 | ) |  |  | 57,716 |
Obligations of states and political subdivisions |  |  | 5,160 |  |  |  | 36 |  |  |  | (45 | ) |  |  | 5,151 |
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Total |  | $ | 141,100 |  |  | $ | 191 |  |  | $ | (4,033 | ) |  | $ | 137,258 |
|  | Held-to-Maturity |
|  | September 30 , 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 12,357 |  |  | $ | — |  |  | $ | (408 | ) |  | $ | 11,949 |
Obligations of U.S. government-sponsored agencies |  |  | 8,126 |  |  |  | — |  |  |  | (323 | ) |  |  | 7,803 |
Obligations of states and political subdivisions |  |  | 1,755 |  |  |  | — |  |  |  | (28 | ) |  |  | 1,727 |
Total |  | $ | 22,238 |  |  | $ | — |  |  | $ | (759 | ) |  | $ | 21,479 |
|  | 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 |  | $ | 1,351 |  |  | $ | 1,351 |  |  | $ | — |  |  | $ | — |
Maturing after one to five years |  |  | 38,063 |  |  |  | 37,271 |  |  |  | 1,116 |  |  |  | 1,106 |
Maturing after five to ten years |  |  | 59,244 |  |  |  | 57,214 |  |  |  | 7,564 |  |  |  | 7,327 |
Maturing after ten years |  |  | 42,442 |  |  |  | 41,422 |  |  |  | 13,558 |  |  |  | 13,046 |
Total |  | $ | 141,100 |  |  | $ | 137,258 |  |  | $ | 22,238 |  |  | $ | 21,479 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Available-for-Sale |
|  | September 30 , 2018 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 28,238 |  |  | $ | (591 | ) |  | $ | 39,667 |  |  | $ | (1,305 | )
Commercial |  |  | 9,681 |  |  |  | (252 | ) |  |  | 47,607 |  |  |  | (1,839 | )
Obligations of states and political subdivisions |  |  | 1,645 |  |  |  | (22 | ) |  |  | 1,487 |  |  |  | (24 | )
U.S. Treasury securities |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 39,644 |  |  | $ | (865 | ) |  | $ | 88,761 |  |  | $ | (3,168 | )
|  | Held-to-Maturity |
|  | September 30 , 2018 |
|  | Less than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in Thousands) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | 3,797 |  |  | $ | (111 | ) |  | $ | 8,152 |  |  | $ | (297 | )
Obligations of U.S. government-sponsored agencies |  |  | 660 |  |  |  | (14 | ) |  |  | 7,143 |  |  |  | (310 | )
Obligations of states and political subdivisions |  |  | 1,209 |  |  |  | (21 | ) |  |  | 518 |  |  |  | (6 | )
Total |  | $ | 5,666 |  |  | $ | (146 | ) |  | $ | 15,813 |  |  | $ | (613 | )
|  | Available-for-Sale |
|  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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