Quarterly report pursuant to Section 13 or 15(d)

Fair Value by Balance Sheet Grouping (Details)

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Fair Value by Balance Sheet Grouping (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available-for-sale Securities $ 12,697,908   $ 12,256,727      
Trading Securities 1,993,124   1,000,180      
Mortgage loans held-for-sale, at fair value 445,065   544,581 559,737   58,607
Mortgage loans held-for-investment in securitization trusts, at fair value 1,428,890   792,390      
Mortgage servicing rights 498,466 500,490 514,402 15,703 1,452 0
Cash and Cash Equivalents, at Carrying Value 1,225,281   1,025,487 723,160   821,108
Restricted Cash and Cash Equivalents 310,421   401,647      
Derivative Asset, Fair Value, Gross Asset 353,893   549,859      
Cost Method Investments 3,000   0      
Securities Sold under Agreements to Repurchase 12,274,878   12,250,450      
Collateralized borrowings in securitization trust, at fair value 938,506   639,731      
Federal Home Loan Bank advances 1,500,000   0      
Derivative Liability, Fair Value, Gross Liability 4,221   22,081      
Federal Home Loan Bank of Des Moines [Member]
           
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Federal Home Loan Bank advances $ 1,500,000