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Note 12 - Borrowings and Financing Activities (Tables)
 3 Months Ended
Mar. 31, 2021
Senior Notes [Abstract]  
Schedule of Debt [Table Text Block]
The carrying value of our debt at March 31, 2021 and December 31, 2020 was as follows.
(In thousands) March 31,
2021		December 31,
2020
Senior notes:
Senior Notes due 2024$445,787 $445,512 
Senior Notes due 2025517,065 516,634 
Senior Notes due 2027443,751 443,528 
Total senior notes$1,406,603 $1,405,674 
FHLB advances:
FHLB advances due 2021$26,850 $67,500 
FHLB advances due 202261,050 61,050 
FHLB advances due 202327,995 27,995 
FHLB advances due 20249,954 9,954 
FHLB advances due 20259,984 9,984 
FHLB advances due 20273,000 — 
Total FHLB advances$138,833 $176,483