Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 5,002,230	$ 2,644,405
Weighted Average Rate	5.47%	4.18%
Fair Value of Collateral Pledged	$ 5,279,554	$ 2,810,957
Residential Mortgage Backed Securities [Member] | Agency MBS
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 4,743,159	$ 2,349,181
Weighted Average Rate	5.46%	4.15%
Fair Value of Collateral Pledged	$ 5,003,785	$ 2,496,781
Commercial Mortgage Backed Securities [Member] | Agency MBS
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 107,663	$ 108,580
Weighted Average Rate	5.41%	3.76%
Fair Value of Collateral Pledged	$ 110,557	$ 108,146
Interest-Only-Strip [Member] | Agency MBS
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 121,956	$ 137,569
Weighted Average Rate	5.82%	4.62%
Fair Value of Collateral Pledged	$ 132,580	$ 150,517
Interest-Only-Strip [Member] | Non-Agency MBS
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 29,452	$ 49,075
Weighted Average Rate	6.18%	5.26%
Fair Value of Collateral Pledged	$ 32,632	$ 55,513