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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Abstract]    
Beginning balance at December 31, 2018 $ 1,342,468  
Origination of mortgage loans 10,090,347 $ 7,552,229
Gains (premiums on loan sales) 29,784  
Proceeds from sale of mortgage loans:    
Sale of mortgage loans (10,069,484)  
Cash collections of premiums on loan sales (29,784)  
Proceeds from sale of mortgage loans (10,099,268) $ (7,019,614)
Net increase in mortgage servicing rights included in warehouse receivables 2,597  
Ending balance at June 30, 2019 $ 1,365,928