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Note 4 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | March 31, 2017 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 291,278 |  |  | $ | 584 |  |  | $ | 4,649 |  |  | $ | 287,213 |
State s and political subdivisions |  |  | 9,977 |  |  |  | 185 |  |  |  | --- |  |  |  | 10,162 |
Mortgage-backed securities |  |  | 782 |  |  |  | 82 |  |  |  | --- |  |  |  | 864 |
Corporate debt securities |  |  | 6,015 |  |  |  | 69 |  |  |  | 127 |  |  |  | 5,957 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 9 |  |  |  | 180 |
Total securities available for sale |  | $ | 308,241 |  |  | $ | 920 |  |  | $ | 4,785 |  |  | $ | 304,376 |
|  | December 31, 201 6 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 291,271 |  |  | $ | 492 |  |  | $ | 6,165 |  |  | $ | 285,598 |
States and political subdivisions |  |  | 11,482 |  |  |  | 211 |  |  |  | --- |  |  |  | 11,693 |
Mortgage-backed securities |  |  | 845 |  |  |  | 85 |  |  |  | --- |  |  |  | 930 |
Corporate debt securities |  |  | 6,015 |  |  |  | 20 |  |  |  | 137 |  |  |  | 5,898 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 26 |  |  |  | 163 |
Total securities available for sale |  | $ | 309,842 |  |  | $ | 808 |  |  | $ | 6,328 |  |  | $ | 304,282 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | March 31, 2017 |
|  | Amortized Cost |  |  | Fair Value |
Available for S ale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 4,160 |  |  | $ | 4,169 |
Due after one year through five years |  |  | 204,152 |  |  |  | 201,752 |
Due after give years through ten years |  |  | 75,541 |  |  |  | 73,852 |
Due after ten years |  |  | 24,199 |  |  |  | 24,423 |
No maturity |  |  | 189 |  |  |  | 180 |
Total securities available for sale |  | $ | 308,241 |  |  | $ | 304,376 |
|  | March 31, 2017 |
|  | Amortized Cost |  |  | Fair Value |
Held to maturity : |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 7,620 |  |  | $ | 7,778 |
Due after one year through five years |  |  | 26,018 |  |  |  | 27,490 |
Due after give years through ten years |  |  | 20,849 |  |  |  | 21,558 |
Due after ten years |  |  | 79,109 |  |  |  | 80,308 |
Total securities held to maturity |  | $ | 133,596 |  |  | $ | 137,134 |
Held-to-maturity Securities [Table Text Block] |
|  | March 31, 2017 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 3,934 |  |  | $ | 220 |  |  | $ | --- |  |  | $ | 4,154 |
State s and political subdivisions |  |  | 128,437 |  |  |  | 3,834 |  |  |  | 558 |  |  |  | 131,713 |
Mortgage-backed securities |  |  | 248 |  |  |  | 28 |  |  |  | --- |  |  |  | 276 |
Corporate debt securities |  |  | 977 |  |  |  | 14 |  |  |  | --- |  |  |  | 991 |
Total securities held to maturity |  | $ | 133,596 |  |  | $ | 4,096 |  |  | $ | 558 |  |  | $ | 137,134 |
|  | December 31, 201 6 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 3,934 |  |  | $ | 201 |  |  | $ | --- |  |  | $ | 4,135 |
States and political subdivisions |  |  | 129,783 |  |  |  | 3,579 |  |  |  | 1,082 |  |  |  | 132,280 |
Mortgage-backed securities |  |  | 265 |  |  |  | 30 |  |  |  | --- |  |  |  | 295 |
Corporate debt securities |  |  | 975 |  |  |  | 7 |  |  |  | --- |  |  |  | 982 |
Total securities held to maturity |  | $ | 134,957 |  |  | $ | 3,817 |  |  | $ | 1,082 |  |  | $ | 137,692 |
Schedule of Temporary Impairment Losses, Investments [Table Text Block] |
|  | March 31, 2017 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily I mpaired S ecurities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Gove rnment agencies and corporations |  | $ | 264,648 |  |  | $ | 4,645 |  |  | $ | 1,995 |  |  | $ | 4 |
State s and political subdivisions |  |  | 21,505 |  |  |  | 483 |  |  |  | 1,389 |  |  |  | 75 |
Corporate debt securities |  |  | 2,890 |  |  |  | 127 |  |  |  | --- |  |  |  | --- |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 180 |  |  |  | 9 |
Total |  | $ | 289,043 |  |  | $ | 5,255 |  |  | $ | 3,564 |  |  | $ | 88 |
|  | December 31, 201 6 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily I mpaired S ecurities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 260,150 |  |  | $ | 6,161 |  |  | $ | 996 |  |  | $ | 4 |
States and political subdivisions |  |  | 31,257 |  |  |  | 934 |  |  |  | 1,316 |  |  |  | 148 |
Corporate debt securities |  |  | 3,888 |  |  |  | 137 |  |  |  | --- |  |  |  | --- |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 163 |  |  |  | 26 |
Total |  | $ | 295,295 |  |  | $ | 7,232 |  |  | $ | 2,475 |  |  | $ | 178 |

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