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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Warehouse Receivables And Warehouse Lines Of Credit [Abstract]      
Beginning balance at December 31, 2018 $ 1,342,468    
Origination of mortgage loans 19,389,979 $ 20,591,602 $ 17,655,104
Gains (premiums on loan sales) 64,002    
Proceeds from sale of mortgage loans:      
Sale of mortgage loans (19,741,058)    
Cash collections of premiums on loan sales (64,002)    
Proceeds from sale of mortgage loans (19,805,060) (20,230,676) $ (18,052,756)
Net increase in mortgage servicing rights included in warehouse receivables 1,669    
Ending balance at December 31, 2019 $ 993,058 $ 1,342,468