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Repurchase Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 2,514,984 $ 2,565,902
Weighted Average Rate 2.21% 1.67%
Fair Value of Collateral Pledged $ 2,703,216 $ 2,765,099
Payable for unsettled securities 529 156,899
RMBS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 1,076,707 $ 836,281
Weighted Average Rate 2.08% 1.47%
Fair Value of Collateral Pledged $ 1,133,919 $ 867,120
CMBS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 849,693 $ 1,003,146
Weighted Average Rate 2.05% 1.44%
Fair Value of Collateral Pledged $ 905,690 $ 1,071,904
CMBS | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 0 $ 15,508
Weighted Average Rate 0.00% 2.47%
Fair Value of Collateral Pledged $ 0 $ 18,212
CMBS IO | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 301,559 $ 324,163
Weighted Average Rate 2.53% 2.17%
Fair Value of Collateral Pledged $ 334,539 $ 372,077
CMBS IO | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 229,638 $ 263,694
Weighted Average Rate 2.99% 2.43%
Fair Value of Collateral Pledged $ 271,145 $ 311,571
U.S. Treasuries    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Balance $ 57,387 $ 123,110
Weighted Average Rate 2.25% 1.85%
Fair Value of Collateral Pledged $ 57,923 $ 124,215