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
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Available-for-Sale Securities $ 14,892,315   $ 13,666,954    
Trading Securities 1,001,172   1,002,062    
Equity securities 0   335,638    
Loans Held-for-sale, Mortgages 958,201   58,607    
Mortgage loans held-for-investment in securitization trust, at fair value 401,347   0    
Cash and Cash Equivalents, at Carrying Value 917,224   821,108 496,674 360,016
Restricted Cash and Cash Equivalents 685,965   302,322    
Derivative Asset, Fair Value, Gross Asset 699,351   462,080    
Mortgage servicing rights 1,452 0 0    
Securities Sold under Agreements to Repurchase 14,903,155   12,624,510    
Collateralized borrowings in securitization trust, at fair value 363,012   0    
Derivative Liability, Fair Value, Gross Liability $ 46,028   $ 129,294