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Note 5 - Investments Investments Trading Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Unrealized Gain (Loss) on Trading Securities Held | $ 10,000 |  | $ 16,800
Trading Securities | 636,276 | [1] | 879,862
US government and agency securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 0 |  | 33,042
State and municipal obligations |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 214,599 |  | 259,573
Corporate bonds and notes |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 327,306 |  | 453,617
RMBS |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 31,742 |  | 38,214
CMBS |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 58,337 |  | 78,984
Other ABS |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | 0 |  | 8,219
Foreign government securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Trading Securities | $ 4,292 |  | $ 8,213
[1] | Includes loaned securities under securities lending agreements that are classified as other assets in our condensed consolidated balance sheets, as further described below.

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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