Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Rollforward of Mortgage Servicing Rights, at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, at fair value, at beginning of period $ 1,086,717 $ 693,815  
Additions from purchases of mortgage servicing rights 146,899 76,956  
Additions from sales of residential mortgage loans 0 20  
Changes in valuation inputs or assumptions used in the valuation model 100,709 3,182  
Other changes in fair value (29,202) (17,997)  
Other changes (4,100) (8,396)  
Mortgage servicing rights, at fair value, at end of period 1,301,023 $ 747,580  
Mortgage servicing rights, at fair value, pledged as collateral for borrowings $ 826,514   $ 584,247