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Secured Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 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 $ 2,898,952 $ 3,109,420
Secured borrowing, weighted average interest rate 1.03% 0.69%
Fair Value of Collateral Pledged $ 3,149,839 $ 3,367,412
Weighted average maturity remaining 20 days 22 days
Line of Credit Facility, Amount Outstanding $ 329,424  
Line of Credit Facility, Maximum Borrowing Capacity $ 350,000  
Line of Credit Facility, Interest Rate at Period End 1.64%  
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 $ 4,803 $ 7,035
Secured borrowing, weighted average interest rate 2.00% 1.65%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 5,278 $ 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 $ 1,157,302 $ 1,439,436
Secured borrowing, weighted average interest rate 0.82% 0.47%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 1,191,147 $ 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 $ 26,149 $ 52,128
Secured borrowing, weighted average interest rate 1.98% 1.77%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 31,952 $ 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 $ 1,005,726 $ 301,427
Secured borrowing, weighted average interest rate 0.82% 0.49%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 1,095,002 $ 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 $ 66,881 $ 126,378
Secured borrowing, weighted average interest rate 1.63% 1.26%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 77,840 $ 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 $ 346,892 $ 360,245
Secured borrowing, weighted average interest rate 1.57% 1.24%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 407,481 $ 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 $ 291,199 $ 302,771
Secured borrowing, weighted average interest rate 1.67% 1.33%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 341,139 $ 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 $ 2,898,952 $ 2,589,420
Secured borrowing, weighted average interest rate 1.03% 0.75%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 3,149,839 $ 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 $ 0 $ 520,000
Secured borrowing, weighted average interest rate 0.00% 0.40%
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank $ 0 $ 541,771 [1]
[1] FHLB advances were collateralized primarily with Agency CMBS as of December 31, 2015.