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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 4,815,452 $ 3,267,984
Weighted Average Rate 2.69% 2.69%
Fair Value of Collateral Pledged $ 5,132,400 $ 3,511,604
Payable for unsettled securities 425,897 58,915
Agency | Commercial Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 1,448,977 $ 919,833
Weighted Average Rate 2.66% 2.51%
Fair Value of Collateral Pledged $ 1,569,019 $ 986,861
Agency | Residential Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 2,938,383 $ 1,887,878
Weighted Average Rate 2.65% 2.66%
Fair Value of Collateral Pledged $ 3,073,151 $ 1,998,922
Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 241,552 $ 253,258
Weighted Average Rate 2.97% 2.96%
Fair Value of Collateral Pledged $ 270,668 $ 285,247
Non-Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 186,540 $ 207,015
Weighted Average Rate 3.30% 3.38%
Fair Value of Collateral Pledged $ 219,562 $ 240,574