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)

v3.19.1
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, 2019
USD ($)
counterparty
Dec. 31, 2018
USD ($)
counterparty
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 19,729,691 $ 23,133,476
Net Counterparty Exposure $ 1,712,165 $ 2,022,074
Weighted Average Days to Maturity 75 days 66 days
Payables due to counterparties for unsettled securities purchases $ 2,100,000  
Repurchase Agreement Counterparty, Royal Bank of Canada [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 2,657,910 $ 2,504,438
Net Counterparty Exposure $ 304,256 $ 342,739
Percent of Equity 6.00% 8.00%
Weighted Average Days to Maturity 59 days 94 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 17,071,781 $ 20,629,038
Net Counterparty Exposure $ 1,407,909 $ 1,679,335
Percent of Equity 29.00% 39.00%
Weighted Average Days to Maturity 77 days 63 days
Number of repurchase agreement counterparties with whom amount at risk is less than 10 percent of stockholders' equity | counterparty 29 29