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Note 2 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Marketable Securities [Table Text Block] |
June 30, 2017 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 336,786 |  |  | $ | 204 |  |  | $ | (6,248 | ) |  | $ | 330,742 |
State, County & Municipal |  |  | 4,891 |  |  |  | 40 |  |  |  | (27 | ) |  |  | 4,904 |
Corporate Bonds |  |  | 2,056 |  |  |  | 8 |  |  |  | - |  |  |  | 2,064 |
|  | $ | 343,733 |  |  | $ | 252 |  |  | $ | (6,275 | ) |  | $ | 337,710 |
December 31, 2016 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 326,694 |  |  | $ | 76 |  |  | $ | (7,673 | ) |  | $ | 319,097 |
State, County & Municipal |  |  | 4,573 |  |  |  | 18 |  |  |  | (30 | ) |  |  | 4,561 |
|  | $ | 331,267 |  |  | $ | 94 |  |  | $ | (7,703 | ) |  | $ | 323,658 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities |
|  | Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Due In One Year or Less |  | $ | 665 |  |  | $ | 667 |
Due After One Year Through Five Years |  |  | 4,535 |  |  |  | 4,524 |
Due After Five Years Through Ten Years |  |  | 1,053 |  |  |  | 1,077 |
Due After Ten Years |  |  | 694 |  |  |  | 700 |
|  | $ | 6,947 |  |  | $ | 6,968 |
Mortgage-Backed Securities |  |  | 336,786 |  |  |  | 330,742 |
|  | $ | 343,733 |  |  | $ | 337,710 |
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies Mortgage-Backed |  | $ | 170,412 |  |  | $ | (2,499 | ) |  | $ | 108,285 |  |  | $ | (3,749 | ) |  | $ | 278,697 |  |  | $ | (6,248 | )
State, County and Municipal |  |  | 1,776 |  |  |  | (27 | ) |  |  | - |  |  |  | - |  |  |  | 1,776 |  |  |  | (27 | )
|  | $ | 172,188 |  |  | $ | (2,526 | ) |  | $ | 108,285 |  |  | $ | (3,749 | ) |  | $ | 280,473 |  |  | $ | (6,275 | )
December 31. 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies Mortgage-Backed |  | $ | 174,201 |  |  | $ | (3,460 | ) |  | $ | 107,482 |  |  | $ | (4,213 | ) |  | $ | 281,683 |  |  | $ | (7,673 | )
State, County and Municipal |  |  | 3,488 |  |  |  | (30 | ) |  |  | - |  |  |  | - |  |  |  | 3,488 |  |  |  | (30 | )
|  | $ | 177,689 |  |  | $ | (3,490 | ) |  | $ | 107,482 |  |  | $ | (4,213 | ) |  | $ | 285,171 |  |  | $ | (7,703 | )

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