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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 2,849,916 $ 2,437,163
Weighted Average Rate 0.23% 0.34%
Fair Value of Collateral Pledged $ 3,011,319 $ 2,609,075
Amortized cost of securities sold but unsettled   141,215
Receivable for securities pending settlement 2,771 150,432
Repurchase agreement amount for which securities sold but unsettled as of reporting date are pledged as collateral.   140,612
Agency RMBS-designated as AFS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 2,408,126 $ 1,874,176
Weighted Average Rate 0.17% 0.23%
Fair Value of Collateral Pledged $ 2,536,094 $ 1,973,608 [1]
Agency CMBS-designated as AFS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 176,268 $ 237,649
Weighted Average Rate 0.14% 0.23%
Fair Value of Collateral Pledged $ 184,847 $ 255,741
Agency CMBS IO -designated as AFS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 180,912 $ 209,393
Weighted Average Rate 0.68% 0.90%
Fair Value of Collateral Pledged $ 192,481 $ 243,042
Agency CMBS IO -designated as AFS | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 84,610 $ 115,945
Weighted Average Rate 0.99% 1.28%
Fair Value of Collateral Pledged $ 97,897 $ 136,684
[1] The amounts for fair value of collateral pledged in the table above as of December 31, 2020 include securities with an amortized cost of $141,215 which were sold but not settled as of that date, and for which the proceeds of $150,432 are recorded within “receivable for securities pending settlement” on the consolidated balance sheet. These securities collateralized $140,612 of the Company’s repurchase agreement borrowings outstanding as of December 31, 2020.