Quarterly report pursuant to Section 13 or 15(d)

Reverse Repurchase Agreements Reverse Repurchase Agreements (Details)

v3.19.2
Reverse Repurchase Agreements Reverse Repurchase Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Gross amount of cash collateral received not offset against reverse repurchase agreements in the balance sheet $ 109,500 $ 0
Reverse repurchase agreements $ 109,500 761,815
Short US Treasuries [Member]    
Derivative [Line Items]    
Fair Value   $ 781,500