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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 1,400,217 $ 1,050,228 $ 1,294,817 $ 1,486,395
Sales and other transfers 0 (51) 0 (107)
Recognized on the sale of residential mortgage loans 35,802 9,128 70,062 15,689
Purchase of MSRs 733,538 15,255 770,316 46,745
Servicing transfers and adjustments (1,606) 1,307 (2,134) (263,443)
Changes in fair value:        
Changes in valuation inputs or assumptions (38,396) 9,792 45,619 (151,473)
Realization of expected cash flows (57,037) (40,746) (106,162) (88,893)
Ending balance 2,072,518 1,044,913 2,072,518 1,044,913
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 708,663 294,227 578,957 714,006
Sales and other transfers 0 0 0 0
Recognized on the sale of residential mortgage loans 35,802 9,128 70,062 15,689
Purchase of MSRs 733,538 15,255 770,316 46,745
Servicing transfers and adjustments 27 11 56 (263,846)
Changes in fair value:        
Changes in valuation inputs or assumptions (42,337) 5,321 40,149 (161,815)
Realization of expected cash flows (27,273) (18,857) (51,120) (45,694)
Ending balance 1,408,420 305,085 1,408,420 305,085
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 691,554 756,001 715,860 772,389
Sales and other transfers 0 (51) 0 (107)
Recognized on the sale of residential mortgage loans 0 0 0 0
Purchase of MSRs 0 0 0 0
Servicing transfers and adjustments (1,633) 1,296 (2,190) 403
Changes in fair value:        
Changes in valuation inputs or assumptions 3,941 4,471 5,470 10,342
Realization of expected cash flows (29,764) (21,889) (55,042) (43,199)
Ending balance $ 664,098 $ 739,828 $ 664,098 $ 739,828