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Warehouse Receivables & Warehouse Lines of Credit - Warehouse Receivables Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Warehouse Receivables Activity [Roll Forward]    
Beginning balance at December 31, 2020 $ 1,411,170  
Origination of mortgage loans 3,909,261 $ 3,859,407
Gains (premiums on loan sales) 25,696  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (4,617,989)  
Cash collections of premiums on loan sales (25,696)  
Proceeds from sale of mortgage loans (4,643,685) $ (3,595,631)
Net decrease in mortgage servicing rights included in warehouse receivables (16,125)  
Ending balance at March 31, 2021 $ 686,317