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Note 6 - Investments Investments Trading Securities (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities Loaned, Asset $ 27,964,000    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 0 $ 0 $ 0
Trading Securities 606,434,000 [1] 879,862,000  
Trading Securities, Change in Unrealized Holding Gain (Loss) 13,230,000 27,217,000 (27,015,000)
Investments 4,643,942,000 4,462,430,000  
Securities (Assets)      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities, Change in Unrealized Holding Gain (Loss) 8,800,000 16,800,000 $ (25,200,000)
US government and agency securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 0 33,042,000  
State and municipal obligations      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 214,841,000 259,573,000  
Corporate bonds and notes      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 307,271,000 453,617,000  
RMBS      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 29,520,000 38,214,000  
CMBS      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 50,561,000 78,984,000  
Other ABS      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 0 8,219,000  
Foreign Government Debt Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities 4,241,000 8,213,000  
Foreign Government Debt Securities [Member] | Portugal, Ireland, Italy, Greece, Spain and Hungary Government Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Investments 0 $ 0  
Securities Financing Transaction, Fair Value [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities Loaned, Asset [2] 27,964,000    
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities Loaned, Asset [2] 13,862,000    
Securities Financing Transaction, Fair Value [Member] | Foreign Government Debt Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities Loaned, Asset [2] 867,000    
Securities Financing Transaction, Fair Value [Member] | Equity securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities Loaned, Asset [2] $ 13,235,000    
[1] 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.
[2] Our securities loaned under securities lending agreements are included at fair value within other assets on our consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.