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Note 5 - Fair Value of Financial Instruments - Other Fair Value Disclosure (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes $ 1,404,759 $ 887,110
FHLB advances 141,058 134,875
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes 1,404,759 887,110
FHLB advances 141,058 134,875
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Fair Value 1,450,590 949,500
FHLB advances, Fair Value $ 144,280 $ 135,997