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Secured Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
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 $ 2,863,480   $ 3,109,420
Secured borrowing, weighted average interest rate 0.85%   0.69%
Fair Value of Collateral Pledged $ 3,116,380   $ 3,367,412
Weighted average maturity remaining 21 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 $ 6,182   $ 7,035
Secured borrowing, weighted average interest rate 1.80%   1.65%
Fair Value of Collateral Pledged $ 6,685   $ 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 $ 1,284,519   $ 1,439,436
Secured borrowing, weighted average interest rate 0.67%   0.47%
Fair Value of Collateral Pledged $ 1,334,785   $ 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 $ 45,581   $ 52,128
Secured borrowing, weighted average interest rate 1.81%   1.77%
Fair Value of Collateral Pledged $ 54,577   $ 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 $ 547,234   $ 301,427
Secured borrowing, weighted average interest rate 0.67%   0.49%
Fair Value of Collateral Pledged $ 592,932   $ 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 $ 101,795   $ 126,378
Secured borrowing, weighted average interest rate 1.37%   1.26%
Fair Value of Collateral Pledged $ 117,564   $ 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 $ 331,263   $ 360,245
Secured borrowing, weighted average interest rate 1.30%   1.24%
Fair Value of Collateral Pledged $ 388,185   $ 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 $ 283,906   $ 302,771
Secured borrowing, weighted average interest rate 1.39%   1.33%
Fair Value of Collateral Pledged $ 338,357   $ 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 $ 2,600,480   $ 2,589,420
Secured borrowing, weighted average interest rate 0.88%   0.75%
Fair Value of Collateral Pledged $ 2,833,085   $ 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 $ 283,295   $ 541,771 [1]
[1] As of June 30, 2016 and December 31, 2015, FHLB advances were collateralized primarily with Agency CMBS.