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Contractual Maturity Information Regarding Repurchase Agreements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement $ 15,019,880 $ 16,129,683
Weighted Average Contractual Rate 0.32% 0.37%
Within 30 days
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement 11,966,137 13,170,898
Weighted Average Contractual Rate 0.31% 0.37%
30 days to 3 months
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement 2,553,743 2,958,785
Weighted Average Contractual Rate 0.31% 0.40%
3 months to 36 months
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement $ 500,000  
Weighted Average Contractual Rate 0.51%