Quarterly report pursuant to Section 13 or 15(d)

Rollforward of Mortgage Servicing Rights, at Fair Value (Details)

v3.10.0.1
Rollforward of Mortgage Servicing Rights, at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]          
Mortgage servicing rights, at fair value, at beginning of period $ 1,450,261 $ 898,025 $ 1,086,717 $ 693,815  
Additions from purchases of mortgage servicing rights 201,197 66,280 480,462 340,156  
Additions from sales of residential mortgage loans 0 0 0 20  
Subtractions from sales of mortgage servicing rights 0 0 0 946  
Changes in valuation inputs or assumptions used in the valuation model 62,680 (154) 209,610 (23,083)  
Other changes in fair value (42,085) (28,595) (107,754) (66,543)  
Other changes (8,029) (4,943) (5,011) (12,806)  
Mortgage servicing rights, at fair value, at end of period 1,664,024 $ 930,613 1,664,024 $ 930,613  
Mortgage servicing rights, at fair value, pledged as collateral for borrowings $ 1,200,000   $ 1,200,000   $ 600,000