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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance $ 2,250,147 $ 1,294,817
Sales and other transfers (149,335) 0
Recognized on the sale of residential mortgage loans 45,803 34,260
Purchase of MSRs 46,799 36,778
Servicing transfers and adjustments (823) (528)
Changes in fair value:    
Changes in valuation inputs or assumptions 203,520 84,015
Realization of expected cash flows (72,830) (49,125)
Ending balance 2,323,281 1,400,217
Fair Value Agency Mortgage Servicing Rights    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 1,571,837 578,957
Sales and other transfers (149,311) 0
Recognized on the sale of residential mortgage loans 45,803 34,260
Purchase of MSRs 46,799 36,778
Servicing transfers and adjustments 0 29
Changes in fair value:    
Changes in valuation inputs or assumptions 194,476 82,486
Realization of expected cash flows (47,674) (23,847)
Ending balance 1,661,930 708,663
Fair Value Non-Agency Mortgage Servicing Rights    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 678,310 715,860
Sales and other transfers (24) 0
Recognized on the sale of residential mortgage loans 0 0
Purchase of MSRs 0 0
Servicing transfers and adjustments (823) (557)
Changes in fair value:    
Changes in valuation inputs or assumptions 9,044 1,529
Realization of expected cash flows (25,156) (25,278)
Ending balance $ 661,351 $ 691,554