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Repurchase Agreements - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Person
Dec. 31, 2012
Person
Repurchase Agreement Counterparty [Line Items]    
Number of counterparties in repurchase agreements 25 24
Weighted average contractual maturity of the repurchase agreements outstanding (in months) 24 days 24 days
Repurchase agreements $ 16,129,683 $ 22,866,429
Weighted Average Contractual Rate 0.37% 0.47%
Fair value of assets pledged as collateral under repurchase agreements $ 17,088,392 $ 24,268,949