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Note 2 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Marketable Securities [Table Text Block] |
September 30, 2016 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 282,681 |  |  | $ | 816 |  |  | $ | (2,116 | ) |  | $ | 281,381 |
State, County & Municipal |  |  | 4,607 |  |  |  | 101 |  |  |  | - |  |  |  | 4,708 |
|  | $ | 287,288 |  |  | $ | 917 |  |  | $ | (2,116 | ) |  | $ | 286,089 |
December 31, 2015 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 297,779 |  |  | $ | 63 |  |  | $ | (6,792 | ) |  | $ | 291,050 |
State, County & Municipal |  |  | 5,089 |  |  |  | 30 |  |  |  | (20 | ) |  |  | 5,099 |
|  | $ | 302,868 |  |  | $ | 93 |  |  | $ | (6,812 | ) |  | $ | 296,149 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities |
|  | Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Due In One Year or Less |  | $ | 346 |  |  | $ | 348 |
Due After One Year Through Five Years |  |  | 1,662 |  |  |  | 1,685 |
Due After Five Years Through Ten Years |  |  | 1,109 |  |  |  | 1,139 |
Due After Ten Years |  |  | 1,490 |  |  |  | 1,536 |
|  | $ | 4,607 |  |  | $ | 4,708 |
Mortgage-Backed Securities |  |  | 282,681 |  |  |  | 281,381 |
|  | $ | 287,288 |  |  | $ | 286,089 |
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 |
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 62,927 |  |  | $ | (301 | ) |  | $ | 110,587 |  |  | $ | (1,815 | ) |  | $ | 173,514 |  |  | $ | (2,116 | )
|  | $ | 62,927 |  |  | $ | (301 | ) |  | $ | 110,587 |  |  | $ | (1,815 | ) |  | $ | 173,514 |  |  | $ | (2,116 | )
December 31. 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 139,765 |  |  | $ | (1,270 | ) |  | $ | 139,720 |  |  | $ | (5,522 | ) |  | $ | 279,485 |  |  | $ | (6,792 | )
State, County and Municipal |  |  | 1,035 |  |  |  | (20 | ) |  |  | - |  |  |  | - |  |  |  | 1,035 |  |  |  | (20 | )
|  | $ | 140,800 |  |  | $ | (1,290 | ) |  | $ | 139,720 |  |  | $ | (5,522 | ) |  | $ | 280,520 |  |  | $ | (6,812 | )

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