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Mortgage Servicing Rights, Net - Schedule of Servicing Fees and Escrow Interest (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Transfers And Servicing [Abstract]    
Servicing fees $ 25,132 $ 22,050
Escrow interest and placement fees 2,967 1,459
Ancillary fees 827 1,323
Total servicing fees and escrow interest $ 28,926 $ 24,832