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Note 2 - Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | $ 37,615 | $ 139,765
Continuous unrealized loss, less than 12 months, gross unrealized losses | (202) | (1,270)
Continuous unrealized loss, greater than 12 months, fair value | 126,577 | 139,720
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (2,431) | (5,522)
Continuous unrealized loss, fair value | 164,192 | 279,485
Continuous unrealized loss, gross unrealized losses | (2,633) | (6,792)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 701 | 1,035
Continuous unrealized loss, less than 12 months, gross unrealized losses | (12) | $ (20)
Continuous unrealized loss, greater than 12 months, fair value | 249 |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (7) |
Continuous unrealized loss, fair value | 950 | $ 1,035
Continuous unrealized loss, gross unrealized losses | (19) | (20)
Continuous unrealized loss, less than 12 months, fair value | 38,316 | 140,800
Continuous unrealized loss, less than 12 months, gross unrealized losses | (214) | (1,290)
Continuous unrealized loss, greater than 12 months, fair value | 126,826 | 139,720
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (2,438) | (5,522)
Continuous unrealized loss, fair value | 165,142 | 280,520
Continuous unrealized loss, gross unrealized losses | $ (2,652) | $ (6,812)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 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 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 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 + Details
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