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Note 3 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Marketable Securities [Table Text Block] |
June 30, 2019 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 403,165 |  |  | $ | 3,406 |  |  | $ | (3,163 | ) |  | $ | 403,408 |
State, County & Municipal |  |  | 3,511 |  |  |  | 63 |  |  |  | - |  |  |  | 3,574 |
Corporate Bonds |  |  | 2,870 |  |  |  | - |  |  |  | (13 | ) |  |  | 2,857 |
|  | $ | 409,546 |  |  | $ | 3,469 |  |  | $ | (3,176 | ) |  | $ | 409,839 |
December 31, 2018 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 356,498 |  |  | $ | 303 |  |  | $ | (10,596 | ) |  | $ | 346,205 |
State, County & Municipal |  |  | 4,008 |  |  |  | 18 |  |  |  | (37 | ) |  |  | 3,989 |
Corporate Bonds |  |  | 2,927 |  |  |  | - |  |  |  | (55 | ) |  |  | 2,872 |
|  | $ | 363,433 |  |  | $ | 321 |  |  | $ | (10,688 | ) |  | $ | 353,066 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities |
|  | Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Due In One Year or Less |  | $ | - |  |  | $ | - |
Due After One Year Through Five Years |  |  | 4,142 |  |  |  | 4,147 |
Due After Five Years Through Ten Years |  |  | 1,135 |  |  |  | 1,167 |
Due After Ten Years |  |  | 1,104 |  |  |  | 1,117 |
|  | $ | 6,381 |  |  | $ | 6,431 |
Mortgage-Backed Securities |  |  | 403,165 |  |  |  | 403,408 |
|  | $ | 409,546 |  |  | $ | 409,839 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 9,891 |  |  | $ | (19 | ) |  | $ | 182,244 |  |  | $ | (3,144 | ) |  | $ | 192,135 |  |  | $ | (3,163 | )
State, County and Municipal |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Corporate Bonds |  |  | 2,015 |  |  |  | (6 | ) |  |  | 842 |  |  |  | (7 | ) |  |  | 2,857 |  |  |  | (13 | )
|  | $ | 11,906 |  |  | $ | (25 | ) |  | $ | 183,086 |  |  | $ | (3,151 | ) |  | $ | 194,992 |  |  | $ | (3,176 | )
December 31. 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies Mortgage-Backed |  | $ | 39,083 |  |  | $ | (504 | ) |  | $ | 255,747 |  |  | $ | (10,092 | ) |  | $ | 294,830 |  |  | $ | (10,596 | )
State, County and Municipal |  |  | 612 |  |  |  | (3 | ) |  |  | 1,882 |  |  |  | (34 | ) |  |  | 2,494 |  |  |  | (37 | )
Corporate Bonds |  |  | 2,009 |  |  |  | (21 | ) |  |  | 863 |  |  |  | (34 | ) |  |  | 2,872 |  |  |  | (55 | )
|  | $ | 41,704 |  |  | $ | (528 | ) |  | $ | 258,492 |  |  | $ | (10,160 | ) |  | $ | 300,196 |  |  | $ | (10,688 | )

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