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, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available-for-sale securities, at fair value $ 28,318,558   $ 25,552,604      
Mortgage servicing rights, at fair value 1,651,556 $ 1,800,826 1,993,440 $ 1,664,024 $ 1,450,261 $ 1,086,717
Cash and cash equivalents 740,698   409,758      
Restricted cash 509,689   688,006      
Derivative assets, at fair value 230,620   319,981      
Reverse repurchase agreements 180,575   761,815      
Other assets 18,274   74,412      
Repurchase agreements 25,567,136   23,133,476      
Federal Home Loan Bank advances 50,000   865,024      
Revolving credit facilities 300,000   310,000      
Term notes payable 394,235   0      
Term notes payable, at fair value 400,032   0      
Convertible senior notes 284,635   283,856      
Convertible senior notes, at fair value 294,869   281,951      
Derivative liabilities, at fair value 17,201   820,590      
Federal Home Loan Bank of Des Moines [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Federal Home Loan Bank advances $ 50,000   $ 865,000