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Mortgage Servicing Rights and Mortgage Servicing Liabilities - Activity in MSRs at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Activity in MSRs carried at fair value      
Balance at beginning of period $ 2,920,603    
Change in fair value due to:      
Balance at end of period 2,163,928    
Mortgage servicing rights      
Activity in MSRs carried at fair value      
Balance at beginning of period 2,926,790 $ 2,820,612  
Additions - Resulting from loan sales 282,315 115,751  
Additions - Purchases 25,760 227,772  
Additions 308,075 343,523  
Change in fair value due to:      
Changes in inputs used in valuation model (915,862) (161,638)  
Other changes in fair value (125,306) (97,407)  
Total change in fair value (1,041,168) (259,045)  
Balance at end of period 2,193,697 $ 2,905,090  
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable $ 2,163,928   $ 2,920,603