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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Abstract]    
Beginning balance at December 31, 2019 $ 993,058  
Origination of mortgage loans 7,162,747 $ 10,090,347
Gains (premiums on loan sales) 33,185  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (7,387,942)  
Cash collections of premiums on loan sales (33,185)  
Proceeds from sale of mortgage loans (7,421,127) $ (10,099,268)
Net decrease in mortgage servicing rights included in warehouse receivables (2,733)  
Ending balance at June 30, 2020 $ 765,130