Quarterly report pursuant to Section 13 or 15(d)

Schedule of Repurchase Agreements by Term, Short or Long (Details)

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Schedule of Repurchase Agreements by Term, Short or Long (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 17,205,823 $ 19,451,207
Maturity up to One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements 16,905,823 19,338,707
Maturity Over One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 300,000 $ 112,500