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
Sep. 30, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Short-term $ 7,982,928 $ 12,839,242
Securities Sold under Agreements to Repuchase, Long-term 0 93,221
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 7,982,928 $ 12,932,463