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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 2,437,163 $ 4,752,348
Weighted Average Rate 0.34% 2.01%
Fair Value of Collateral Pledged $ 2,609,075 $ 5,024,625
Payable for unsettled securities 5 6,180
Receivable for securities sold 150,432 0
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  
Agency | Commercial Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 237,649 $ 1,735,848
Weighted Average Rate 0.23% 1.98%
Fair Value of Collateral Pledged $ 255,741 $ 1,901,452
Agency | Residential Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 1,874,176 $ 2,594,645
Weighted Average Rate 0.23% 1.96%
Fair Value of Collateral Pledged $ 1,973,608 $ 2,647,638
Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 209,393 $ 255,912
Weighted Average Rate 0.90% 2.30%
Fair Value of Collateral Pledged $ 243,042 $ 282,522
Non-Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 115,945 $ 165,943
Weighted Average Rate 1.28% 2.67%
Fair Value of Collateral Pledged $ 136,684 $ 193,013