Quarterly report pursuant to Section 13 or 15(d)

Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details)

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Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 13,640,720 $ 9,316,351
Repurchase Agreement Counterparty, Amount at Risk 1,697,758 1,435,401
Repurchase Agreement Counterparty, Barclays Capital [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 1,086,055 292,086
Repurchase Agreement Counterparty, Amount at Risk $ 244,005 $ 164,315
Repurchase Agreement Counterparty, Percent of Equity at Risk 7.00% 5.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 57 days 26 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 12,554,665 $ 9,024,265
Repurchase Agreement Counterparty, Amount at Risk $ 1,453,753 $ 1,271,086
Repurchase Agreement Counterparty, Percent of Equity at Risk 40.00% 37.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 97 days 79 days
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 23 22