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Warehouse Receivables & Warehouse Lines of Credit - Warehouse Receivables Activity (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Warehouse Receivables Activity [Roll Forward]    
Beginning balance at December 31, 2020 $ 1,411,170  
Origination of mortgage loans 12,712,118 $ 11,727,227
Gains (premiums on loan sales) 61,870  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (12,705,674)  
Cash collections of premiums on loan sales (61,870)  
Proceeds from sale of mortgage loans (12,767,544) $ (11,565,281)
Net decrease in mortgage servicing rights included in warehouse receivables (8,576)  
Ending balance at September 30, 2021 $ 1,409,038