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Note 13 - Fair Value (Tables)
 3 Months Ended
Mar. 31, 2026
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)

  

March 31, 2026

                        

Mortgage-backed securities

   $ -     $ 11,338,541     $ -  

U.S. Treasury securities

     -       155,095       -  

Interest rate swaps

     -       2,628       -  

TBA securities

     -       (254 )     -  

Obligation to return securities borrowed under reverse repurchase agreements

           (359,202 )      

December 31, 2025

                        

Mortgage-backed securities

   $ -     $ 10,628,658     $ -  

U.S. Treasury securities

     -       135,133       -  

Interest rate swaps

     -       8,238       -  

TBA securities

     -       (831 )     -  

Obligation to return securities borrowed under reverse repurchase agreements

           (128,724 )