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
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available-for-sale securities, at fair value $ 14,284,625   $ 7,825,320      
Residential mortgage loans held-for-sale, at fair value 723,174   811,431      
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,620,037   3,173,727      
Commercial real estate assets 1,114,548 $ 926,377 660,953 $ 290,910 $ 45,605 $ 0
Commercial real estate assets, at fair value 1,113,756          
Mortgage servicing rights, at fair value 455,629 $ 427,813 493,688 447,345 $ 437,576 452,006
Cash and cash equivalents 688,418   737,831 $ 811,839   $ 1,005,792
Restricted cash 264,872   262,562      
Derivative assets, at fair value 199,013   271,509      
Federal Home Loan Bank stock 167,856   156,650      
Cost Method Investments 3,000   3,000      
Repurchase agreements 10,637,373   5,008,274      
Collateralized borrowings in securitization trusts, at fair value 3,375,906   2,000,110      
Federal Home Loan Bank advances 4,000,000   3,785,000      
Revolving credit facilities 30,000   0      
Derivative liabilities, at fair value 39,918   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