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Contractual Maturity Information Regarding Repurchase Agreements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement $ 14,920,959 $ 16,129,683
Weighted Average Contractual Rate 0.32% 0.37%
Within 30 days
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement 13,355,150 13,170,898
Weighted Average Contractual Rate 0.31% 0.37%
30 days to 3 months
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement 565,809 2,958,785
Weighted Average Contractual Rate 0.32% 0.40%
3 months to 36 months
   
Repurchase Agreement Counterparty [Line Items]    
Balance, repurchase agreement $ 1,000,000  
Weighted Average Contractual Rate 0.45%