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Repurchase Agreements and Other Advances (Details 2)
$ in Thousands
Dec. 31, 2016
USD ($)
counterparty
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
counterparty
Information about MBS and CRT securities      
Gross amount of recognized liabilities for repurchase agreements in Note 8 $ 8,472,268    
Amounts related to repurchase agreements not included in offsetting disclosure in Note 8 0    
Unamortized debt issuance expense $ 210   $ 1,300
Repurchase agreements, number of counterparties | counterparty 31   27
Threshold percent of stockholders' equity at risk with single counterparty to repurchase agreements or Linked Transactions (greater than) 5.00%    
Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 8,472,478 $ 8,472,478 $ 7,888,902
Weighted Average Interest Rate 1.79%   1.48%
Gross amount of recognized liabilities for repurchase agreements in Note 8 $ 8,472,268   $ 7,887,622
Unamortized debt issuance expense 210   1,280
Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 3,095,020 3,095,020 2,727,542
Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 1,690,937 1,690,937 1,960,222
Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 2,078,684 2,078,684 2,080,163
Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 504,572 504,572 504,760
Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 271,205 271,205 128,465
Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements 832,060 $ 832,060 $ 487,750
Overnight | Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 0    
Weighted Average Interest Rate 0.00%    
Overnight | Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements $ 0    
Overnight | Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 0    
Overnight | Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 0    
Overnight | Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 0    
Overnight | Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 0    
Overnight | Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements 0    
Within 30 days | Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 5,926,375    
Weighted Average Interest Rate 1.67%    
Within 30 days | Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements $ 2,768,277    
Within 30 days | Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 1,006,956    
Within 30 days | Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 1,379,254    
Within 30 days | Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 504,572    
Within 30 days | Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 267,316    
Within 30 days | Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 30 days to 90 days | Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 1,349,588    
Weighted Average Interest Rate 1.76%    
Over 30 days to 90 days | Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements $ 326,743    
Over 30 days to 90 days | Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 433,244    
Over 30 days to 90 days | Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 467,873    
Over 30 days to 90 days | Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 30 days to 90 days | Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 3,889    
Over 30 days to 90 days | Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements 117,839    
Over 90 days to 12 months | Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 1,196,515    
Weighted Average Interest Rate 2.72%    
Over 90 days to 12 months | Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements $ 0    
Over 90 days to 12 months | Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 250,737    
Over 90 days to 12 months | Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 231,557    
Over 90 days to 12 months | Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 90 days to 12 months | Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 90 days to 12 months | Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements 714,221    
Over 12 months | Repurchase agreements      
Information about MBS and CRT securities      
Repurchase agreements $ 0    
Weighted Average Interest Rate 0.00%    
Over 12 months | Repurchase agreements | Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements $ 0    
Over 12 months | Repurchase agreements | Non-Agency MBS      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 12 months | Repurchase agreements | 3 Year Step-up securities      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 12 months | Repurchase agreements | U.S. Treasuries      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 12 months | Repurchase agreements | CRT securities      
Information about MBS and CRT securities      
Repurchase agreements 0    
Over 12 months | Repurchase agreements | Residential whole loans      
Information about MBS and CRT securities      
Repurchase agreements $ 0