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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   $ 1,294,817 $ 1,486,395 $ 1,457,149
Sales   0 (143) (4,344)
Recognized on the sale of residential mortgage loans   222,715 68,734 8,795
Purchase of MSRs $ 575,300 844,122 285,134 153,505
Servicing transfers and adjustments   (10,782) (265,845) (7,309)
Changes in valuation inputs or assumptions (2)   149,514 (108,051) 75,885
Realization of cash flows (2)   (250,239) (171,407) (197,286)
Ending balance   2,250,147 1,294,817 1,486,395
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   578,957 714,006 865,587
Sales   0 0 (3,578)
Recognized on the sale of residential mortgage loans   222,715 68,734 8,795
Purchase of MSRs   844,122 285,134 153,505
Servicing transfers and adjustments   117 (266,248) 0
Changes in valuation inputs or assumptions (2)   62,437 (145,308) (192,323)
Realization of cash flows (2)   (136,511) (77,361) (117,980)
Ending balance   1,571,837 578,957 714,006
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   715,860 772,389 591,562
Sales   0 (143) (766)
Recognized on the sale of residential mortgage loans   0 0 0
Purchase of MSRs   0 0 0
Servicing transfers and adjustments   (10,899) 403 (7,309)
Changes in valuation inputs or assumptions (2)   87,077 37,257 268,208
Realization of cash flows (2)   (113,728) (94,046) (79,306)
Ending balance   $ 678,310 $ 715,860 $ 772,389