Annual report pursuant to Section 13 and 15(d)

Repurchase Agreements (Details)

v3.8.0.1
Repurchase Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Repurchase Agreements [Abstract]    
Repurchase agreements $ 19,451,207 $ 8,865,184
Weighted average borrowing rate 1.69% 1.22%
Weighted average remaining maturity 83 days 57 days