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Repurchase Agreements and Other Advances (Details) - Securities Sold under Agreements to Repurchase - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Weighted average remaining term-to-interest rate reset of borrowings under repurchase agreements 21 days 25 days
Effective repricing period 16 months 21 months
Balance of repurchase agreements $ 9,210,834 $ 8,267,388
Agency Mortgage Backed Securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements 4,151,976 5,177,835
Fair value of securities pledged as collateral under repurchase agreements $ 4,373,565 $ 5,462,566
Weighted average haircut (percent) 4.70% 4.79%
Legacy Non-Agency MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 2,043,188 $ 2,233,236
Fair value of securities pledged as collateral under repurchase agreements $ 2,974,878 $ 3,491,312
Weighted average haircut (percent) 25.74% 28.88%
Non-Agency MBS acquired from consolidated VIEs $ 588,600 $ 1,275,000
RPL/NPL MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements 1,997,579 130,919
Fair value of securities pledged as collateral under repurchase agreements $ 2,487,168 $ 160,688
Weighted average haircut (percent) 21.29% 20.00%
U.S. Treasuries    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 497,973 $ 507,114
Fair value of securities pledged as collateral under repurchase agreements $ 508,838 $ 512,105
Weighted average haircut (percent) 2.00% 1.62%
CRT securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 92,566 $ 75,960
Fair value of securities pledged as collateral under repurchase agreements $ 118,616 $ 94,610
Weighted average haircut (percent) 25.17% 25.00%
Residential whole loans    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 427,552 $ 142,324
Fair value of securities pledged as collateral under repurchase agreements $ 595,503 $ 212,986
Weighted average haircut (percent) 27.69% 33.43%