Annual report pursuant to Section 13 and 15(d)

Reverse Repurchase Agreements Reverse Repurchase Agreements (Details)

v3.19.1
Reverse Repurchase Agreements Reverse Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Reverse repurchase agreements $ 761,815 $ 0
Short US Treasury Securities [Member]    
Derivative [Line Items]    
Fair Value $ (781,500) $ 0