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Repurchase Agreements (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 5,494,428,000 $ 5,381,104,000
Weighted Average Rate 5.46% 5.59%
Fair Value of Collateral Pledged $ 5,788,148,000 $ 5,880,747,000
Securities Received as Collateral 2,400,000  
Collateral Securities Repledged, Delivered, or Used 0  
Accrued interest payable 54,567,000 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 $ 5,284,233,000 $ 5,130,438,000
Weighted Average Rate 5.46% 5.59%
Fair Value of Collateral Pledged $ 5,562,905,000 $ 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 $ 92,472,000 $ 104,495,000
Weighted Average Rate 5.45% 5.60%
Fair Value of Collateral Pledged $ 96,046,000 $ 113,753,000
Interest-Only-Strip [Member] | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 103,281,000 $ 120,979,000
Weighted Average Rate 5.75% 5.83%
Fair Value of Collateral Pledged $ 113,334,000 $ 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 $ 14,442,000 $ 25,192,000
Weighted Average Rate 6.17% 6.25%
Fair Value of Collateral Pledged $ 15,863,000 $ 25,959,000