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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 2,323,281 $ 1,400,217 $ 2,250,147 $ 1,294,817
Sales of MSRs (28) 0 (149,363) 0
Recognized on the sale of residential mortgage loans 60,162 35,802 105,965 70,062
Purchase of MSRs 36,863 733,538 83,662 770,316
Servicing transfers and adjustments 14,721 (1,606) 13,898 (2,134)
Changes in fair value:        
Changes in valuation inputs or assumptions 118,252 (38,396) 321,772 45,619
Realization of expected cash flows (67,572) (57,037) (140,402) (106,162)
Ending balance 2,485,679 2,072,518 2,485,679 2,072,518
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 1,664,855 708,663 1,571,837 578,957
Sales of MSRs (28) 0 (149,339) 0
Recognized on the sale of residential mortgage loans 60,162 35,802 105,965 70,062
Purchase of MSRs 36,863 733,538 83,662 770,316
Servicing transfers and adjustments 11,795 27 14,720 56
Changes in fair value:        
Changes in valuation inputs or assumptions 85,955 (42,337) 280,431 40,149
Realization of expected cash flows (42,998) (27,273) (90,672) (51,120)
Ending balance 1,816,604 1,408,420 1,816,604 1,408,420
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 658,426 691,554 678,310 715,860
Sales of MSRs 0 0 (24) 0
Recognized on the sale of residential mortgage loans 0 0 0 0
Purchase of MSRs 0 0 0 0
Servicing transfers and adjustments 2,926 (1,633) (822) (2,190)
Changes in fair value:        
Changes in valuation inputs or assumptions 32,297 3,941 41,341 5,470
Realization of expected cash flows (24,574) (29,764) (49,730) (55,042)
Ending balance $ 669,075 $ 664,098 $ 669,075 $ 664,098