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Secured Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 2,741,278 $ 3,109,420
Secured borrowing, weighted average interest rate 0.88% 0.69%
Fair Value of Collateral Pledged $ 2,975,014 $ 3,367,412
Weighted average maturity remaining 18 days 22 days
Securitization financing bond    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 5,424 $ 7,035
Secured borrowing, weighted average interest rate 1.86% 1.65%
Fair Value of Collateral Pledged $ 5,882 $ 8,054
RMBS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 1,156,635 $ 1,439,436
Secured borrowing, weighted average interest rate 0.70% 0.47%
Fair Value of Collateral Pledged $ 1,204,542 $ 1,483,152
RMBS | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 38,613 $ 52,128
Secured borrowing, weighted average interest rate 1.88% 1.77%
Fair Value of Collateral Pledged $ 41,082 $ 64,286
CMBS | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 594,661 $ 301,427
Secured borrowing, weighted average interest rate 0.69% 0.49%
Fair Value of Collateral Pledged $ 643,207 $ 345,728
CMBS | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 69,687 $ 126,378
Secured borrowing, weighted average interest rate 1.50% 1.26%
Fair Value of Collateral Pledged $ 82,573 $ 143,785
CMBS IO | Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 322,632 $ 360,245
Secured borrowing, weighted average interest rate 1.38% 1.24%
Fair Value of Collateral Pledged $ 378,875 $ 421,285
CMBS IO | Non-Agency MBS    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 290,626 $ 302,771
Secured borrowing, weighted average interest rate 1.45% 1.33%
Fair Value of Collateral Pledged $ 343,900 $ 359,351
Repurchase agreements    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 2,478,278 $ 2,589,420
Secured borrowing, weighted average interest rate 0.91% 0.75%
Fair Value of Collateral Pledged $ 2,700,061 $ 2,825,641
Federal Home Loan Bank Advances [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 263,000 $ 520,000
Secured borrowing, weighted average interest rate 0.51% 0.40%
Fair Value of Collateral Pledged $ 274,953 $ 541,771 [1]
[1] As of September 30, 2016 and December 31, 2015, FHLB advances were collateralized primarily with Agency CMBS.