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Mortgage Servicing Rights, Net - Schedule of Servicing Fees and Escrow Interest (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Transfers and Servicing [Abstract]        
Servicing fees $ 29,432 $ 26,526 $ 84,347 $ 78,134
Escrow interest and placement fees 876 6,518 4,995 17,505
Ancillary fees 2,060 3,955 5,584 11,270
Total servicing fees and escrow interest $ 32,368 $ 36,999 $ 94,926 $ 106,909