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Repurchase Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 2,589,420 $ 3,013,110
Repurchage agreement, Weighted Average Interest Rate 0.75% 0.55%
Fair Value of Collateral Pledged $ 2,825,641 $ 3,274,597
Weighted average maturity remaining 22 days 88 days
Securitization financing bond [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 7,035 $ 9,834
Repurchage agreement, Weighted Average Interest Rate 1.65% 1.51%
Fair Value of Collateral Pledged $ 8,054 $ 11,000
RMBS [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 1,439,436 $ 1,977,338
Repurchage agreement, Weighted Average Interest Rate 0.47% 0.39%
Fair Value of Collateral Pledged $ 1,483,152 $ 2,064,704
RMBS [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 52,128 $ 17,594
Repurchage agreement, Weighted Average Interest Rate 1.77% 1.57%
Fair Value of Collateral Pledged $ 64,286 $ 21,787
CMBS [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 301,427 $ 253,857
Repurchage agreement, Weighted Average Interest Rate 0.49% 0.36%
Fair Value of Collateral Pledged $ 345,728 $ 291,103
CMBS [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 126,378 $ 114,895
Repurchage agreement, Weighted Average Interest Rate 1.26% 1.15%
Fair Value of Collateral Pledged $ 143,785 $ 140,216
CMBS IO [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 360,245 $ 372,609
Repurchage agreement, Weighted Average Interest Rate 1.24% 0.92%
Fair Value of Collateral Pledged $ 421,285 $ 430,638
CMBS IO [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 302,771 $ 266,983
Repurchage agreement, Weighted Average Interest Rate 1.33% 1.04%
Fair Value of Collateral Pledged $ 359,351 $ 315,149