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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 2,527,065 $ 2,437,163
Weighted Average Rate 0.20% 0.34%
Fair Value of Collateral Pledged (1) $ 2,677,652 $ 2,609,075
Payable for unsettled securities   5
Receivable for sales pending settlement 806 150,432
Repurchase agreement amount for which securities sold but unsettled as of reporting date are pledged as collateral.   140,612
Amortized cost of securities sold but unsettled   141,215
Residential Mortgage Backed Securities | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 2,069,312 $ 1,874,176
Weighted Average Rate 0.13% 0.23%
Fair Value of Collateral Pledged (1) $ 2,166,848 $ 1,973,608 [1]
Commercial Mortgage Backed Securities | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 186,575 $ 237,649
Weighted Average Rate 0.13% 0.23%
Fair Value of Collateral Pledged (1) $ 198,487 $ 255,741
Interest-Only-Strip | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 180,425 $ 209,393
Weighted Average Rate 0.68% 0.90%
Fair Value of Collateral Pledged (1) $ 203,319 $ 243,042
Interest-Only-Strip | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 90,753 $ 115,945
Weighted Average Rate 0.98% 1.28%
Fair Value of Collateral Pledged (1) $ 108,998 $ 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 sales 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.