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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 1,050,228 $ 1,400,191 $ 1,486,395 $ 1,457,149
Sales and other transfers (51) (3) (107) (570)
Recognized on the sale of residential mortgage loans 9,128 1,188 15,689 2,698
Purchase of MSRs 15,255 59,979 46,745 114,389
Servicing transfers and adjustments 1,307 (1,454) (263,443) (4,767)
Changes in fair value:        
Changes in valuation inputs or other assumptions 249 (94,820) (156,495) (159,093)
Realization of expected future cash flows and other changes (31,202) (52,448) (83,870) (97,173)
Ending balance 1,044,914 1,312,633 1,044,914 1,312,633
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 294,227 825,692 714,006 865,587
Sales and other transfers 0 406 0 (29)
Recognized on the sale of residential mortgage loans 9,128 1,188 15,689 2,698
Purchase of MSRs 15,255 59,892 46,745 114,302
Servicing transfers and adjustments 11 0 (263,846) 0
Changes in fair value:        
Changes in valuation inputs or other assumptions 3,711 (107,559) (163,425) (171,676)
Realization of expected future cash flows and other changes (17,247) (33,884) (44,084) (65,147)
Ending balance 305,085 745,735 305,085 745,735
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 756,001 574,499 772,389 591,562
Sales and other transfers (51) (409) (107) (541)
Recognized on the sale of residential mortgage loans 0 0 0 0
Purchase of MSRs 0 87 0 87
Servicing transfers and adjustments 1,296 (1,454) 403 (4,767)
Changes in fair value:        
Changes in valuation inputs or other assumptions (3,462) 12,739 6,930 12,583
Realization of expected future cash flows and other changes (13,955) (18,564) (39,786) (32,026)
Ending balance $ 739,829 $ 566,898 $ 739,829 $ 566,898