Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value by Balance Sheet Grouping (Details)

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Fair Value Fair Value by Balance Sheet Grouping (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Available-for-Sale Securities $ 12,672,233   $ 13,666,954    
Trading Securities 1,000,625   1,002,062    
Equity securities 0   335,638    
Loans Held-for-sale, Mortgages 559,737   58,607    
Mortgage loans held-for-investment in securitization trust, at fair value 804,988   0    
Cash and Cash Equivalents, at Carrying Value 723,160   821,108 833,608 360,016
Restricted Cash and Cash Equivalents 678,328   302,322    
Derivative Asset, Fair Value, Gross Asset 544,515   462,080    
Mortgage servicing rights 15,703 1,452 0    
Securities Sold under Agreements to Repurchase 12,152,065   12,624,510    
Collateralized borrowings in securitization trust, at fair value 649,082   0    
Derivative Liability, Fair Value, Gross Liability $ 73,827   $ 129,294