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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Abstract]    
Beginning balance at December 31, 2018 $ 1,342,468  
Origination of mortgage loans 4,646,348 $ 3,132,008
Gains (premiums on loan sales) 8,515  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (4,445,282)  
Cash collections of premiums on loan sales (8,515)  
Proceeds from sale of mortgage loans (4,453,797) $ (2,910,181)
Net increase in mortgage servicing rights included in warehouse receivables 4,715  
Ending balance at March 31, 2019 $ 1,548,249