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)

v3.19.1
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