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Mortgage Servicing Rights and Mortgage Servicing Liabilities - Activity in MSRs at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Change in fair value due to:          
Total change in fair value $ 205,789 $ 365,979 $ 1,241,002 $ 623,393  
Mortgage servicing rights          
Activity in MSRs carried at fair value          
Balance at beginning of period 2,193,697 2,905,090 2,926,790 2,820,612  
Additions - Resulting from loan sales 225,534 183,331 507,849 299,082  
Additions - Purchases (purchase adjustments)   (373) 25,760 227,399  
Additions 225,534 182,958 533,609 526,481  
Change in fair value due to:          
Changes in valuation inputs used in valuation model (98,681) (256,449) (1,014,543) (418,087)  
Other changes in fair value (107,011) (111,264) (232,317) (208,671)  
Total change in fair value (205,692) (367,713) (1,246,860) (626,758)  
Balance at end of period 2,213,539 $ 2,720,335 2,213,539 $ 2,720,335  
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable secured by mortgage servicing assets $ 2,209,928   $ 2,209,928   $ 2,920,603