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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Marketable Securities [Table Text Block] |
(dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 5,133 |  |  | $ | 36 |  |  | $ | (54) |  |  | $ | 5,115 |
Corporate debt securities |  |  | 2,811 |  |  |  | 11 |  |  |  | (16) |  |  |  | 2,806 |
Mortgage-backed securities |  |  | 338,930 |  |  |  | 2,669 |  |  |  | (2,188) |  |  |  | 339,411 |
Total debt securities |  | $ | 346,874 |  |  | $ | 2,716 |  |  | $ | (2,258) |  |  | $ | 347,332 |
(dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 4,008 |  |  | $ | 18 |  |  | $ | (37) |  |  | $ | 3,989 |
Corporate debt securities |  |  | 2,927 |  |  |  | - |  |  |  | (55) |  |  |  | 2,872 |
Mortgage-backed securities |  |  | 356,498 |  |  |  | 303 |  |  |  | (10,596) |  |  |  | 346,205 |
Total debt securities |  | $ | 363,433 |  |  | $ | 321 |  |  | $ | (10,688) |  |  | $ | 353,066 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
(dollars in thousands) |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  |  | 3,257 |  |  |  | (54) |  |  |  | - |  |  |  | - |  |  |  | 3,257 |  |  |  | (54) |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 784 |  |  |  | (16) |  |  |  | 784 |  |  |  | (16) |
Mortgage-backed securities |  |  | 60,860 |  |  |  | (277) |  |  |  | 119,110 |  |  |  | (1,911) |  |  |  | 179,970 |  |  |  | (2,188) |
Total debt securities |  | $ | 64,117 |  |  | $ | (331) |  |  | $ | 119,894 |  |  | $ | (1,927) |  |  | $ | 184,011 |  |  | $ | (2,258) |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  |  | 612 |  |  |  | (3) |  |  |  | 1,882 |  |  |  | (34) |  |  |  | 2,494 |  |  |  | (37) |
Corporate debt securities |  |  | 2,009 |  |  |  | (21) |  |  |  | 863 |  |  |  | (34) |  |  |  | 2,872 |  |  |  | (55) |
Mortgage-backed securities |  |  | 39,083 |  |  |  | (504) |  |  |  | 255,747 |  |  |  | (10,092) |  |  |  | 294,830 |  |  |  | (10,596) |
Total debt securities |  | $ | 41,704 |  |  | $ | (528) |  |  | $ | 258,492 |  |  | $ | (10,160) |  |  | $ | 300,196 |  |  | $ | (10,688) |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities |
|  | Available for Sale |
(dollars in thousands) |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 150 |  |  | $ | 150 |
Due after one year through five years |  |  | 3,195 |  |  |  | 3,215 |
Due after five years through ten years |  |  | 723 |  |  |  | 744 |
Due after ten years |  |  | 3,876 |  |  |  | 3,812 |
|  | $ | 7,944 |  |  | $ | 7,921 |
Mortgage-backed securities |  |  | 338,930 |  |  |  | 339,411 |
|  | $ | 346,874 |  |  | $ | 347,332 |

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