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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available-for-Sale Securities $ 12,634,056 $ 12,256,727    
Trading Securities 1,000,312 1,000,180    
Loans Held-for-sale, Mortgages 161,021 544,581    
Mortgage loans held-for-investment in securitization trust, at fair value 781,085 792,390    
Mortgage servicing rights 476,663 514,402 0 0
Cash and Cash Equivalents, at Carrying Value 1,540,431 1,025,487 1,140,706 821,108
Restricted Cash and Cash Equivalents 220,202 401,647    
Derivative Asset, Fair Value, Gross Asset 429,419 549,859    
Cost Method Investments 3,000 0    
Securities Sold under Agreements to Repurchase 12,021,177 12,250,450    
Collateralized borrowings in securitization trust, at fair value 658,953 639,731    
Federal Home Loan Bank advances 464,476 0    
Derivative Liability, Fair Value, Gross Liability 8,395 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 $ 464,476