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Note 13 - Fair Value (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

(in thousands)

                       
   

Quoted Prices

                 
   

in Active

   

Significant

         
   

Markets for

   

Other

   

Significant

 
   

Identical

   

Observable

   

Unobservable

 
   

Assets

   

Inputs

   

Inputs

 
   

(Level 1)

   

(Level 2)

   

(Level 3)

 

June 30, 2024

                       

Mortgage-backed securities

  $ -     $ 4,525,755     $ -  

U.S. Treasury securities

    98,099       -       -  

Interest rate swaps

    -       29,214       -  

Dual digital option

    -       105       -  

TBA securities

    -       (844 )     -  

December 31, 2023

                       

Mortgage-backed securities

  $ -     $ 3,894,012     $ -  

U.S. Treasury securities

    148,820       -       -  

Interest rate swaps

    -       6,348       -  

Interest rate swaptions

    -       72       -  

TBA securities

    -       (12,694 )     -