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
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available-for-sale Securities $ 9,584,454 $ 7,825,320    
Residential mortgage loans held-for-sale, at fair value 387,259 811,431    
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,705,647 3,173,727    
Commercial real estate assets 744,259 660,953 $ 45,556 $ 0
Mortgage servicing rights 446,170 493,688 410,229 452,006
Cash and Cash Equivalents, at Carrying Value 754,827 737,831 $ 1,020,338 $ 1,005,792
Restricted Cash and Cash Equivalents 281,145 262,562    
Derivative Asset, Fair Value, Gross Asset 197,847 271,509    
Federal Home Loan Bank stock 167,856 156,650    
Cost Method Investments 3,000 3,000    
Securities Sold under Agreements to Repurchase 6,189,852 5,008,274    
Collateralized borrowings in securitization trust, at fair value 2,809,627 2,000,110    
Federal Home Loan Bank advances 4,000,000 3,785,000    
Derivative Liability, Fair Value, Gross Liability 77,038 7,285    
Federal Home Loan Bank of Des Moines [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Federal Home Loan Bank stock 167,856 156,650    
Federal Home Loan Bank advances $ 4,000,000 $ 3,785,000