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Note 5 - Investments Trading Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | $ 383,992 | $ 469,071
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 128,339 | 168,359
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 203,014 | 228,151
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 18,257 | 21,083
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | $ 34,382 | $ 51,478

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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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