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Note 6 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 1,265,672 | $ 1,017,655
Temporarily impaired securities, less than 12 months, unrealized losses | 8,370 | 13,814
Temporarily impaired securities, 12 months or longer, fair value | 36,212 | 35,458
Temporarily impaired securities, 12 months or longer, unrealized losses | 347 | 1,154
Temporarily impaired securities, total fair value | 1,301,884 | 1,053,113
Temporarily impaired securities, total unrealized losses | 8,717 | 14,968
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 569,044 | 299,088
Temporarily impaired securities, less than 12 months, unrealized losses | 524 | 857
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 569,044 | 299,088
Temporarily impaired securities, total unrealized losses | 524 | 857
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 394,631 | 390,331
Temporarily impaired securities, less than 12 months, unrealized losses | 5,369 | 9,669
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 394,631 | 390,331
Temporarily impaired securities, total unrealized losses | 5,369 | 9,669
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 301,997 | 328,236
Temporarily impaired securities, less than 12 months, unrealized losses | 2,477 | 3,288
Temporarily impaired securities, 12 months or longer, fair value | 56 | 62
Temporarily impaired securities, 12 months or longer, unrealized losses | 3 | 2
Temporarily impaired securities, total fair value | 302,053 | 328,298
Temporarily impaired securities, total unrealized losses | 2,480 | 3,290
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, fair value | 29,891 | 29,138
Temporarily impaired securities, 12 months or longer, unrealized losses | 109 | 862
Temporarily impaired securities, total fair value | 29,891 | 29,138
Temporarily impaired securities, total unrealized losses | 109 | 862
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, fair value |  | 28
Temporarily impaired securities, 12 months or longer, unrealized losses |  | 20
Temporarily impaired securities, total fair value |  | 28
Temporarily impaired securities, total unrealized losses |  | 20
Mutual Funds [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, fair value | 6,265 | 6,230
Temporarily impaired securities, 12 months or longer, unrealized losses | 235 | 270
Temporarily impaired securities, total fair value | 6,265 | 6,230
Temporarily impaired securities, total unrealized losses | $ 235 | $ 270

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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=82897076&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=82897076&loc=d3e27337-111563 + Details
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