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Repurchase Agreements and Other Advances (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Repurchase Agreements    
Unamortized debt issuance expense $ 206,000 $ 210,000
Repurchase agreements    
Repurchase Agreements    
Weighted average remaining term-to-interest rate reset of borrowings under repurchase agreements 16 days 19 days
Effective repricing period 11 months 12 months
Repurchase agreements $ 6,614,907,000 $ 8,472,478,000
Unamortized debt issuance expense 206,000 210,000
Total repurchase agreements less debt issuance costs $ 6,614,701,000 $ 8,472,268,000
Weighted Average Interest Rate 2.42% 1.79%
Repurchase agreements | Within 30 days    
Repurchase Agreements    
Repurchase agreements $ 6,161,008,000 $ 7,284,062,000
Weighted Average Interest Rate 2.39% 1.77%
Repurchase agreements | Over 30 days to 3 months    
Repurchase Agreements    
Repurchase agreements $ 453,899,000 $ 1,188,416,000
Weighted Average Interest Rate 2.76% 1.91%
Repurchase agreements | Over 3 months to 12 months    
Repurchase Agreements    
Repurchase agreements $ 0 $ 0
Weighted Average Interest Rate 0.00% 0.00%
Repurchase agreements | Agency MBS    
Repurchase Agreements    
Repurchase agreements $ 2,501,340,000 $ 3,095,020,000
Fair Value of assets pledged as collateral under repurchase agreements $ 2,705,754,000 $ 3,280,689,000
Weighted average haircut rate 4.65% 4.67%
Repurchase agreements | Non-Agency MBS    
Repurchase Agreements    
Repurchase agreements $ 1,256,033,000 $ 1,690,937,000
Fair Value of assets pledged as collateral under repurchase agreements $ 1,652,983,000 $ 2,317,708,000
Weighted average haircut rate 21.87% 24.01%
Non-Agency MBS acquired from consolidated VIEs   $ 172,400,000
Repurchase agreements | RPL/NPL MBS    
Repurchase Agreements    
Repurchase agreements $ 567,140,000 1,943,572,000
Fair Value of assets pledged as collateral under repurchase agreements $ 726,540,000 $ 2,433,711,000
Weighted average haircut rate 22.05% 20.98%
Repurchase agreements | U.S. Treasuries    
Repurchase Agreements    
Repurchase agreements $ 470,334,000 $ 504,572,000
Fair Value of assets pledged as collateral under repurchase agreements $ 472,095,000 $ 510,767,000
Weighted average haircut rate 1.47% 1.60%
Repurchase agreements | CRT securities    
Repurchase Agreements    
Repurchase agreements $ 459,058,000 $ 271,205,000
Fair Value of assets pledged as collateral under repurchase agreements $ 595,900,000 $ 357,488,000
Weighted average haircut rate 22.16% 23.22%
Repurchase agreements | MSR relates assets    
Repurchase Agreements    
Repurchase agreements $ 317,255,000 $ 135,112,000
Fair Value of assets pledged as collateral under repurchase agreements $ 482,158,000 $ 226,780,000
Weighted average haircut rate 33.19% 41.40%
Repurchase agreements | Residential whole loans, at fair value    
Repurchase Agreements    
Repurchase agreements $ 1,043,747,000 $ 832,060,000
Fair Value of assets pledged as collateral under repurchase agreements $ 1,474,704,000 $ 1,175,088,000
Weighted average haircut rate 26.10% 25.03%