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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 4,252,893 $ 3,267,984
Weighted Average Rate 2.78% 2.69%
Fair Value of Collateral Pledged $ 4,537,607 $ 3,511,604
Payable for unsettled securities 151,075 58,915
Agency | Commercial Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 1,220,326 $ 919,833
Weighted Average Rate 2.68% 2.51%
Fair Value of Collateral Pledged $ 1,304,731 $ 986,861
Agency | Residential Mortgage Backed Securities    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 2,582,697 $ 1,887,878
Weighted Average Rate 2.75% 2.66%
Fair Value of Collateral Pledged $ 2,719,705 $ 1,998,922
Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 253,168 $ 253,258
Weighted Average Rate 3.05% 2.96%
Fair Value of Collateral Pledged $ 282,927 $ 285,247
Non-Agency | Interest-Only-Strip    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 196,702 $ 207,015
Weighted Average Rate 3.39% 3.38%
Fair Value of Collateral Pledged $ 230,244 $ 240,574