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 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]            
Servicing rights $ 30,592,187     $ 30,592,187   $ 22,269,362
Weighted average interest rate       3.00%   3.10%
Capitalized servicing rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Beginning balance 26,675,358 $ 22,269,362 $ 402,852 $ 22,269,362 $ 288,057 $ 288,057
Originations 5,139,859 6,312,227 6,849,850   6,986,237  
Purchases 5,537 866,806        
Payoffs, sales and curtailments (1,228,567) (2,773,037) (40,859)   (62,451)  
Changes in fair value due to:            
Ending Balance 30,592,187 26,675,358 7,211,843 30,592,187 7,211,843 22,269,362
Mortgage Servicing Rights [Member]            
Servicing Assets at Fair Value [Line Items]            
Beginning balance 267,364 180,684 3,119 180,684 2,600 2,600
Originations 50,049 65,964 43,561   44,855  
Purchases 61 9,014        
Payoffs, sales and curtailments   (8,647)        
Changes in fair value due to:            
Changes in market inputs or assumptions used in valuation model (16,051) 35,109 (2,749)   (3,424)  
Changes in fair value due to portfolio runoff and other (10,485) (14,760) (1,247)   (1,347)  
Ending Balance 290,938 $ 267,364 $ 42,684 290,938 $ 42,684 180,684
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing rights 29,705,985     29,705,985   20,501,504
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing rights 553,800     553,800   1,727,831
Private Investors [Member]            
Servicing Assets at Fair Value [Line Items]            
Servicing rights $ 332,402     $ 332,402   $ 40,027