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Mortgage Servicing Rights and Mortgage Servicing Liabilities - Activity in MSRs at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Change in fair value due to:          
Total change in fair value $ 127,217 $ 412,730 $ 1,368,219 $ 1,036,123  
Mortgage servicing rights          
Activity in MSRs carried at fair value          
Balance at beginning of period 2,213,539 2,720,335 2,926,790 2,820,612  
Additions - Resulting from loan sales 245,946 246,757 753,795 545,839  
Additions - Purchases (purchase adjustments) (287) 46 25,473 227,445  
Additions 245,659 246,803 779,268 773,284  
Change in fair value due to:          
Changes in valuation inputs used in valuation model (26,208) (286,880) (1,040,751) (704,967)  
Other changes in fair value (99,169) (124,005) (331,486) (332,676)  
Total change in fair value (125,377) (410,885) (1,372,237) (1,037,643)  
Balance at end of period 2,333,821 $ 2,556,253 2,333,821 $ 2,556,253  
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable secured by mortgage servicing assets $ 2,330,600   $ 2,330,600   $ 2,920,603