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Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Marketable Securities [Table Text Block] |
March 31, 2019 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 357,480 |  |  | $ | 883 |  |  | $ | (7,225 | ) |  | $ | 351,138 |
State, County & Municipal |  |  | 3,873 |  |  |  | 34 |  |  |  | (12 | ) |  |  | 3,895 |
Corporate Bonds |  |  | 2,899 |  |  |  | - |  |  |  | (43 | ) |  |  | 2,856 |
|  | $ | 364,252 |  |  | $ | 917 |  |  | $ | (7,280 | ) |  | $ | 357,889 |
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 |  | $ | 351 |  |  | $ | 351 |
Due After One Year Through Five Years |  |  | 4,158 |  |  |  | 4,129 |
Due After Five Years Through Ten Years |  |  | 1,134 |  |  |  | 1,157 |
Due After Ten Years |  |  | 1,129 |  |  |  | 1,114 |
|  | $ | 6,772 |  |  | $ | 6,751 |
Mortgage-Backed Securities |  |  | 357,480 |  |  |  | 351,138 |
|  | $ | 364,252 |  |  | $ | 357,889 |
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 |
March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 12,669 |  |  | $ | (66 | ) |  | $ | 253,449 |  |  | $ | (7,159 | ) |  | $ | 266,118 |  |  | $ | (7,225 | )
State, County and Municipal |  |  | - |  |  |  | - |  |  |  | 1,600 |  |  |  | (12 | ) |  |  | 1,600 |  |  |  | (12 | )
Corporate Bonds |  |  | 2,005 |  |  |  | (20 | ) |  |  | 851 |  |  |  | (23 | ) |  |  | 2,856 |  |  |  | (43 | )
|  | $ | 14,674 |  |  | $ | (86 | ) |  | $ | 255,900 |  |  | $ | (7,194 | ) |  | $ | 270,574 |  |  | $ | (7,280 | )
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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