Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
USD ($)
counterparty
Dec. 31, 2017
USD ($)
counterparty
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 23,133,476 $ 19,451,207
Net Counterparty Exposure $ 2,022,074 $ 1,743,123
Weighted Average Days to Maturity 66 days 83 days
Repurchase Agreement Counterparty, Royal Bank of Canada [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 2,504,438 $ 1,261,956
Net Counterparty Exposure $ 342,739 $ 223,347
Percent of Equity 8.00% 6.00%
Weighted Average Days to Maturity 94 days 75 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 20,629,038 $ 18,189,251
Net Counterparty Exposure $ 1,679,335 $ 1,519,776
Percent of Equity 39.00% 43.00%
Weighted Average Days to Maturity 63 days 84 days
Number of repurchase agreement counterparties with whom amount at risk is less than 10 percent of stockholders' equity | counterparty 29 26