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Note 5 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | June 30, 2016 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 280,386 |  |  | $ | 1,576 |  |  | $ | 239 |  |  | $ | 281,723 |
States and political subdivisions |  |  | 13,573 |  |  |  | 420 |  |  |  | --- |  |  |  | 13,993 |
Mortgage-backed securities |  |  | 1,031 |  |  |  | 113 |  |  |  | --- |  |  |  | 1,144 |
Corporate debt securities |  |  | 6,016 |  |  |  | 260 |  |  |  | 35 |  |  |  | 6,241 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 48 |  |  |  | 141 |
Total securities available for sale |  | $ | 301,195 |  |  | $ | 2,369 |  |  | $ | 322 |  |  | $ | 303,242 |
|  | December 31, 2015 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 216,897 |  |  | $ | 519 |  |  | $ | 4,952 |  |  | $ | 212,464 |
States and political subdivisions |  |  | 15,934 |  |  |  | 541 |  |  |  | --- |  |  |  | 16,475 |
Mortgage-backed securities |  |  | 1,199 |  |  |  | 120 |  |  |  | --- |  |  |  | 1,319 |
Corporate debt securities |  |  | 6,015 |  |  |  | 22 |  |  |  | 291 |  |  |  | 5,746 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 62 |  |  |  | 127 |
Total securities available for sale |  | $ | 240,234 |  |  | $ | 1,202 |  |  | $ | 5,305 |  |  | $ | 236,131 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30 , 201 6 |
|  | Amortized Cost |  |  | Fair Value |
Available for S ale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 7,518 |  |  | $ | 7,539 |
Due after one year through five years |  |  | 174,169 |  |  |  | 174,317 |
Due after give years through ten years |  |  | 51,036 |  |  |  | 51,350 |
Due after ten years |  |  | 68,283 |  |  |  | 69,895 |
No maturity |  |  | 189 |  |  |  | 141 |
Total securities available for sale |  | $ | 301,195 |  |  | $ | 303,242 |
|  | June 30 , 201 6 |
|  | Amortized Cost |  |  | Fair Value |
Held to maturity : |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 2,148 |  |  | $ | 2,188 |
Due after one year through five years |  |  | 20,798 |  |  |  | 22,207 |
Due after give years through ten years |  |  | 17,362 |  |  |  | 18,415 |
Due after ten years |  |  | 98,116 |  |  |  | 103,431 |
Total securities held to maturity |  | $ | 138,424 |  |  | $ | 146,241 |
Held-to-maturity Securities [Table Text Block] |
|  | June 30, 2016 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 3,934 |  |  | $ | 379 |  |  | $ | --- |  |  | $ | 4,313 |
States and political subdivisions |  |  | 132,773 |  |  |  | 7,407 |  |  |  | 36 |  |  |  | 140,144 |
Mortgage-backed securities |  |  | 295 |  |  |  | 36 |  |  |  | --- |  |  |  | 331 |
Corporate debt securities |  |  | 1,422 |  |  |  | 31 |  |  |  | --- |  |  |  | 1,453 |
Total securities held to maturity |  | $ | 138,424 |  |  | $ | 7,853 |  |  | $ | 36 |  |  | $ | 146,241 |
|  | December 31, 2015 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 13,909 |  |  | $ | 288 |  |  | $ | 177 |  |  | $ | 14,020 |
States and political subdivisions |  |  | 136,373 |  |  |  | 6,179 |  |  |  | 330 |  |  |  | 142,222 |
Mortgage-backed securities |  |  | 327 |  |  |  | 36 |  |  |  | --- |  |  |  | 363 |
Corporate debt securities |  |  | 1,419 |  |  |  | 10 |  |  |  | 2 |  |  |  | 1,427 |
Total securities held to maturity |  | $ | 152,028 |  |  | $ | 6,513 |  |  | $ | 509 |  |  | $ | 158,032 |
Schedule of Temporary Impairment Losses, Investments [Table Text Block] |
|  | June 30, 2016 |
|  | 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 |  | $ | 81,878 |  |  | $ | 200 |  |  | $ | 3,659 |  |  | $ | 39 |
States and political subdivisions |  |  | --- |  |  |  | --- |  |  |  | 2,210 |  |  |  | 36 |
Corporate debt securities |  |  | --- |  |  |  | --- |  |  |  | 942 |  |  |  | 35 |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 141 |  |  |  | 48 |
Total |  | $ | 81,878 |  |  | $ | 200 |  |  | $ | 6,952 |  |  | $ | 158 |
|  | December 31, 2015 |
|  | 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 |  | $ | 88,255 |  |  | $ | 1,800 |  |  | $ | 84,959 |  |  | $ | 3,329 |
States and political subdivisions |  |  | 3,449 |  |  |  | 24 |  |  |  | 10,161 |  |  |  | 306 |
Corporate debt securities |  |  | 4,974 |  |  |  | 292 |  |  |  | 200 |  |  |  | 1 |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 127 |  |  |  | 62 |
Total |  | $ | 96,678 |  |  | $ | 2,116 |  |  | $ | 95,447 |  |  | $ | 3,698 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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