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Note 5 - Investments Trading Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | $ 493,956 | $ 606,434 | [1]
State and municipal obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 185,494 | 214,841 |
Corporate bonds and notes |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 235,422 | 307,271 |
RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 22,069 | 29,520 |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 50,971 | 50,561 |
Foreign government and agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | $ 0 | $ 4,241 |
[1] | At December 31, 2017, includes a de minimis amount of loaned securities under securities lending agreements that are classified as other assets in our consolidated balance sheets, as further described below.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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