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Note 2 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Marketable Securities [Table Text Block] |
March 31, 2017 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 342,828 |  |  | $ | 109 |  |  | $ | (7,486 | ) |  | $ | 335,451 |
State, County & Municipal |  |  | 4,444 |  |  |  | 35 |  |  |  | (23 | ) |  |  | 4,456 |
Corporate Bonds |  |  | 2,060 |  |  |  | - |  |  |  | (35 | ) |  |  | 2,025 |
|  | $ | 349,332 |  |  | $ | 144 |  |  | $ | (7,544 | ) |  | $ | 341,932 |
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 |  | $ | 667 |  |  | $ | 672 |
Due After One Year Through Five Years |  |  | 4,449 |  |  |  | 4,421 |
Due After Five Years Through Ten Years |  |  | 694 |  |  |  | 712 |
Due After Ten Years |  |  | 694 |  |  |  | 676 |
|  | $ | 6,504 |  |  | $ | 6,481 |
Mortgage-Backed Securities |  |  | 342,828 |  |  |  | 335,451 |
|  | $ | 349,332 |  |  | $ | 341,932 |
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 196,927 |  |  | $ | (3,362 | ) |  | $ | 108,603 |  |  | $ | (4,124 | ) |  | $ | 305,530 |  |  | $ | (7,486 | )
State, County and Municipal |  |  | 2,138 |  |  |  | (23 | ) |  |  | - |  |  |  | - |  |  |  | 2,138 |  |  |  | (23 | )
Corporate Bonds |  |  | 2,025 |  |  |  | (35 | ) |  |  | - |  |  |  | - |  |  |  | 2,025 |  |  |  | (35 | )
|  | $ | 201,090 |  |  | $ | (3,420 | ) |  | $ | 108,603 |  |  | $ | (4,124 | ) |  | $ | 309,693 |  |  | $ | (7,544 | )
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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