Annual report pursuant to Section 13 and 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
Dec. 31, 2013
Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Short-term $ 12,050,450 $ 12,424,510
Securities Sold under Agreements to Repuchase, Long-term 200,000 200,000
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 12,250,450 $ 12,624,510