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
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available-for-sale Securities $ 13,656,610   $ 7,825,320      
Residential mortgage loans held-for-sale, at fair value 609,060   811,431      
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,446,712   3,173,727      
Commercial real estate assets 926,377 $ 744,259 660,953 $ 45,605 $ 45,556 $ 0
Mortgage servicing rights 427,813 $ 446,170 493,688 437,576 $ 410,229 452,006
Cash and Cash Equivalents, at Carrying Value 692,188   737,831 $ 933,579   $ 1,005,792
Restricted Cash and Cash Equivalents 363,166   262,562      
Derivative Asset, Fair Value, Gross Asset 223,985   271,509      
Federal Home Loan Bank stock 167,856   156,650      
Cost Method Investments 3,000   3,000      
Securities Sold under Agreements to Repurchase 9,669,848   5,008,274      
Collateralized borrowings in securitization trust, at fair value 3,111,861   2,000,110      
Federal Home Loan Bank advances 4,000,000   3,785,000      
Derivative Liability, Fair Value, Gross Liability 160,724   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