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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Abstract]    
Beginning balance at December 31, 2018 $ 1,342,468  
Origination of mortgage loans 15,381,864 $ 13,979,299
Gains (premiums on loan sales) 48,177  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (15,738,623)  
Cash collections of premiums on loan sales (48,177)  
Proceeds from sale of mortgage loans (15,786,800) $ (13,351,590)
Net increase in mortgage servicing rights included in warehouse receivables 2,214  
Ending balance at September 30, 2019 $ 987,923