Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights, at Fair Value - Summary of Servicing Portfolio and its Activities (Detail)

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Mortgage Servicing Rights, at Fair Value - Summary of Servicing Portfolio and its Activities (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]      
Servicing rights $ 34,058,558   $ 39,299,416
Weighted average interest rate 3.12%   3.03%
Changes in fair value due to:      
Ending Balance   $ 26,675,358  
Capitalized servicing rights [Member]      
Servicing Assets at Fair Value [Line Items]      
Beginning balance $ 39,299,416 22,269,362 $ 22,269,362
Originations 4,257,281 6,312,227  
Purchases 0 866,806  
Sold MSRs (8,368,734) (1,090,267)  
Portfolio runoff (805,668) (1,488,977)  
Other (323,737) (193,793)  
Changes in fair value due to:      
Changes in fair value due to portfolio runoff and other (323,737) (193,793)  
Ending Balance 34,058,558   39,299,416
Mortgage Servicing Rights [Member]      
Servicing Assets at Fair Value [Line Items]      
Beginning balance 427,942 180,684 180,684
Originations 53,444 65,964  
Purchases 0 9,014  
Other (11,522) (14,760)  
Payoffs, sales and curtailments (107,652) (8,647)  
Changes in fair value due to:      
Changes in market inputs or assumptions used in valuation model 63,890 35,109  
Changes in fair value due to portfolio runoff and other (11,522) (14,760)  
Ending Balance 426,102 $ 267,364 427,942
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]      
Servicing Assets at Fair Value [Line Items]      
Servicing rights 31,324,584   37,079,995
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]      
Servicing Assets at Fair Value [Line Items]      
Servicing rights 1,656,411   1,109,962
Private Investors [Member]      
Servicing Assets at Fair Value [Line Items]      
Servicing rights $ 1,077,563   $ 1,109,459