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, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Short-term $ 11,297,967 $ 12,050,450
Securities Sold under Agreements to Repuchase, Long-term 93,220 200,000
Assets Sold under Agreements to Repurchase, Repurchase Liability 11,391,187 12,250,450
Maturity Over One Year [Member]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 93,220 $ 200,000