Annual report pursuant to Section 13 and 15(d)

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

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Repurchase Agreements Schedule of Repurchase Agreements by Term, Short or Long (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Short-term $ 12,424,510 $ 6,610,148
Securities Sold under Agreements to Repuchase, Long-term 200,000 50,000
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 12,624,510 $ 6,660,148