Annual report pursuant to Section 13 and 15(d)

Reverse Repurchase Agreements (Details)

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Reverse Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Gross amount of cash collateral received not offset against reverse repurchase agreements in the balance sheet $ 215,565 $ 0
Reverse repurchase agreements $ 220,000 761,815
Short US Treasuries [Member]    
Derivative [Line Items]    
Fair Value   $ 781,500