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Repurchase Agreements (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 5,284,708,000 $ 5,381,104,000
Weighted Average Rate 5.46% 5.59%
Fair Value of Collateral Pledged $ 5,570,076,000 $ 5,880,747,000
Securities Received as Collateral 11,500,000  
Collateral Securities Repledged, Delivered, or Used 0  
Accrued interest payable 35,672,000 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 $ 5,048,942,000 $ 5,130,438,000
Weighted Average Rate 5.46% 5.59%
Fair Value of Collateral Pledged $ 5,319,619,000 $ 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 $ 104,557,000 $ 104,495,000
Weighted Average Rate 5.46% 5.60%
Fair Value of Collateral Pledged $ 109,935,000 $ 113,753,000
Interest-Only-Strip [Member] | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 112,156,000 $ 120,979,000
Weighted Average Rate 5.74% 5.83%
Fair Value of Collateral Pledged $ 120,037,000 $ 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 $ 19,053,000 $ 25,192,000
Weighted Average Rate 6.16% 6.25%
Fair Value of Collateral Pledged $ 20,485,000 $ 25,959,000