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Secured Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 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 $ 2,985,019   $ 3,109,420
Secured borrowing, weighted average interest rate 0.85%   0.69%
Fair Value of Collateral Pledged $ 3,267,309   $ 3,367,412
Weighted average maturity remaining 23 days 22 days  
Securitization financing bond [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 6,443   $ 7,035
Secured borrowing, weighted average interest rate 1.79%   1.65%
Fair Value of Collateral Pledged $ 7,410   $ 8,054
RMBS [Member] | Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 1,410,153   $ 1,439,436
Secured borrowing, weighted average interest rate 0.68%   0.47%
Fair Value of Collateral Pledged $ 1,460,930   $ 1,483,152
RMBS [Member] | Non-Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 48,542   $ 52,128
Secured borrowing, weighted average interest rate 1.80%   1.77%
Fair Value of Collateral Pledged $ 60,053   $ 64,286
CMBS [Member] | Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 516,893   $ 301,427
Secured borrowing, weighted average interest rate 0.68%   0.49%
Fair Value of Collateral Pledged $ 579,169   $ 345,728
CMBS [Member] | Non-Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 101,358   $ 126,378
Secured borrowing, weighted average interest rate 1.36%   1.26%
Fair Value of Collateral Pledged $ 118,154   $ 143,785
CMBS IO [Member] | Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 344,238   $ 360,245
Secured borrowing, weighted average interest rate 1.28%   1.24%
Fair Value of Collateral Pledged $ 406,464   $ 421,285
CMBS IO [Member] | Non-Agency MBS [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 294,392   $ 302,771
Secured borrowing, weighted average interest rate 1.36%   1.33%
Fair Value of Collateral Pledged $ 352,191   $ 359,351
Repurchase agreements [Member]      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 2,722,019   $ 2,589,420
Secured borrowing, weighted average interest rate 0.88%   0.75%
Fair Value of Collateral Pledged $ 2,984,371   $ 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 $ 282,938   $ 541,771