Annual report pursuant to Section 13 and 15(d)

Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details)

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Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 12,250,450 $ 12,624,510
Repurchase Agreement Counterparty, Barclays Capital [Member]
    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,453,396 1,127,888
Repurchase Agreement Counterparty, Amount at Risk 302,744 257,858
Repurchase Agreement Counterparty, Percent of Equity at Risk 8.00% 7.00%
Repurchase Agreement Counterparty, Weighted Average Maturity 74.6 90.3
Repurchase Agreement Counterparty, All Other Counterparties [Member]
    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 9,799,554 10,499,122
Repurchase Agreement Counterparty, Amount at Risk 1,372,086 1,403,268
Repurchase Agreement Counterparty, Percent of Equity at Risk 36.00% 41.00%
Repurchase Agreement Counterparty, Weighted Average Maturity 71.9 84
Repurchase Agreement Counterparty, Excluding Repurchase Agreements Collateralized by U.S. Treasuries [Member]
    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 11,252,950 11,627,010
Repurchase Agreement Counterparty, Amount at Risk 1,674,830 1,661,126
Payables to Broker-Dealers and Clearing Organizations   291,675
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 19 21
US Treasury Securities [Member]
    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 997,500 $ 997,500