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Repurchase Agreements - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Person
Dec. 31, 2013
Person
Repurchase Agreement Counterparty [Line Items]    
Number of counterparties in repurchase agreements 25 25
Weighted average contractual maturity of the repurchase agreements outstanding (in months) 24 days 24 days
Repurchase agreements $ 15,183,457 $ 16,129,683
Weighted Average Contractual Rate 0.33% 0.37%
Fair value of assets pledged as collateral under repurchase agreements $ 15,933,514 $ 17,088,392