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Repurchase Agreements (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 6,423,890,000 $ 5,381,104,000
Weighted Average Rate 5.40% 5.59%
Fair Value of Collateral Pledged $ 6,767,947,000 $ 5,880,747,000
Securities Received as Collateral 21,400,000  
Collateral Securities Repledged, Delivered, or Used 0  
Accrued interest payable 48,570,000 53,194,000
Residential Mortgage Backed Securities [Member] | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 6,221,024,000 $ 5,130,438,000
Weighted Average Rate 5.39% 5.59%
Fair Value of Collateral Pledged $ 6,549,630,000 $ 5,613,212,000
Commercial Mortgage Backed Securities [Member] | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 91,985,000 $ 104,495,000
Weighted Average Rate 5.36% 5.60%
Fair Value of Collateral Pledged $ 97,627,000 $ 113,753,000
Interest-Only-Strip [Member] | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 100,080,000 $ 120,979,000
Weighted Average Rate 5.71% 5.83%
Fair Value of Collateral Pledged $ 108,817,000 $ 127,823,000
Interest-Only-Strip [Member] | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 10,801,000 $ 25,192,000
Weighted Average Rate 6.07% 6.25%
Fair Value of Collateral Pledged $ 11,873,000 $ 25,959,000